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  • Sterling - Hollow Block - 6.8mm - Yellow
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  • Sterling - Hollow Block - 6.8mm - Yellow

Sterling Hollow Block - 6.8mm

$16.95 - $17.95

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    • Yellow, 13.5in
    • Yellow, 19in

    47 Reviews



    Built from Sterling's RIT 900 cord, the Hollow Block 6.8mm x 13.5in is designed to function as a pre-sewn prusik or climb heist. Made with aramid fiber and sewn with Sterling's proprietary sewing pattern, this ultra-strong cord is designed to provide excellent griping power on climbing ropes with diameters of 7mm or larger.
    • Item #STE0040

    Tech Specs

    6.8 mm
    13 in
    16.4 kN
    Recommended Use
    climbing, rescue
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    trust them with my life

      Awesome sling. Kind of in between your average dyneema and nylon sling for thickness and weight. But these are solid and at a perfect price point. These get the job done, I obviously trust them with my life.

      Use to backup rap on ATC

      • Familiarity: I've used it several times

      Just started using this off my leg loop in an auto lock configuration on an extended ATC rappel. Super comfy. Three wraps does it, stays clear of my device and is easy to use. Nice on those long raps with OMG exposure.

      Must have for any type of rope work

      • Familiarity: I've put it through the wringer

      If you're climbing or canyoneering having a Hollow Block is a must. The aramid fiber is specifically used so it won't melt and bond to dyneema when used as a prussik like regular slings can do. Use it as a backup while repelling or many other uses.

      Don't Get Stuck

      • Familiarity: I've used it several times

      Sometime, you rappel off anchors, praying there is a set below you. THis tool can be super handy if you rap a line and cannot find a set of anchors and need to ascend back up. Such a simple thing to have on your harness, but can be a lifesaver.

      Never forget a 3rd hand!

      • Familiarity: I've put it through the wringer

      I was introduced to the hollow block about 2 years ago and have never gone back. This piece never leaves my harness and it has made backing up my extended rappel so much faster and easier! Its great because I don't have to worry about the material being worn due to high heat friction and it allows me to rappel safely without having the jumpy jerky prussik using cord. It's also cut to the perfect length so I never have to guess where to tie my prussik. I've had mine for 2 years, it was previously used by a climbing partner and am just now replacing it because it is pretty dirty and I'd love to have 2!

      Must have!

      • Familiarity: I've used it several times

      Great to have a couple of these because you never know when you will need to have a back up on your rappel system to fix something or to build a new anchor ect... Soft materiel that can take lots of heat to it. The 13.5 inch is the perfect size for my 9.8 rope that I use for sport climbing.

      Third Hand is King

      • Familiarity: I've put it through the wringer

      Golden Rule of Rappelling, use a prusik, ALWAYS. Well traditional homemade prusiks made with nylon have some disadvantages when you introduce nylon on nylon, you have a lot of unwanted added friction to the mix, which will start to heat up quickly and start to melt the fibers of your rope and prusik. Well Sterling has addressed that problem here. This is made of a synthetic polymer fiber so it has a much higher melting point and it doesn't create as high of heated friction because it is to different materials.

      Bottom line, this is the way to go!
      Just pick one up, you will thank yourself later


      • Familiarity: I've put it through the wringer

      I bought one of these after the guys at the local climbing shop recommended it, and I fell in love immediately! These things are so insanely durable, and seem like they might literally last forever. The material they're made of is designed to be extremely heat resistant, so it's perfect for all your friction hitches! Save yourself the trouble of re-tying prusik loops every couple weeks/months (depending on how often you climb); get one of these and you'll be set for at least the next year or two!

      Like it so far.

      • Familiarity: I've used it once or twice and have initial impressions

      Replace this with some cord I had been using for an auto-block while rappelling of climbing routes. I've only used it a few times but like it so far. Seems like it will be even nicer when it gets broken in a bit.

      Does It's Job

      • Familiarity: I've used it several times

      I purchased this to use as a auto-block when rappelling. Prior to buying this, I was using a 5mm cord tied in a loop with a double fisherman's knot. Both cords accomplished the task. However, with the hollow block , you won't have a bulky knot in the middle of the cord. This makes it a little easier to work with. Also, the hollow block sits flusher and cleaner to the rope making it slide a little better than most 5mm cord. I consider this a luxury climbing item considering you can build your own for much cheaper. But, it is a good product that works well.

      safety measures

        I think that rappelling with an auto-block is a good idea.
        Lots of people feel the same way, and there are a bunch of applications for Sterling's cord/other similar loops - I find myself using an auto-block on wandery rappels, when I'm cleaning gear on rappel, and when I'm tired and feel like n extra safety feature might protect me from a lapse in attention/judgement.

        Essential Tool

        • Familiarity: I've put it through the wringer

        I used to carry prussik cords just on big climbs, but this thing is such a better alternative. It is durable, reliable, lightweight, and doesn't involve the big knots of using cordlette. It has worked great for both autoblocking rappels and prussiking up, and it is so lightweight I now take it on all my multipitch climbs.

        Crazy grip strength

        • Familiarity: I've put it through the wringer

        Lightweight and very handy. Easy to tie a prussik/autoblock/klemheist and I trust it more than traditional cordalette. If using on a double rope I would get the larger size.

        Super rugged

          I love the hollow block for its short compact and durable design. Hangs cleanly in a figure 9 knot on a caribeaner, works efficiently as a 3rd hand on single strand or double strand ropes, can wrap about 3 times as an autoblock, unties easily after heavy loads in klemheist, great for 3:1 tension , & can even use as a prussik. Heavy duty resistance to burning and wear an tear. Had one for several months now and i use it in all applications.. Its still going strong. must buy for the price its a great addition to any climbers rack

          Essential and Versatile

          • Familiarity: I've put it through the wringer

          The Hollow Block is an essential piece of gear that I use in many situations. I keep 2 on a locking carabiner along with a Petzl Tibloc and with this combination you can do a variety of self-rescue techniques. The Hollow Block grips rope of almost any diameter and its design makes it much easier to release than a normal cord prussik with a double fisherman's knot. This is my go to for setting up an autoblock as a backup while rappelling and is a key part of my crevasse rescue kit. I highly recommend them for anyone looking for a dedicated prussik cord.

          Question: Is the size (13.5 or 19) the "circumference", the length before it was sewn, or something else? thx


          That'll be the length when laid flat. I've got the 13.5 inch version and it's 13.5 inches from end to end.


          Feel free to contact me with questions on this product or any other climbing gear!

          Is this the 13.5" or the 19"? The description says 13.5", the style/size dropdown says 19".

          You can choose either size, in the drop down menu.

          If it's not giving you both options, there is either a technically difficulty, or we have sold out of one size. At this moment, we have plenty of both sizes.

          Questions? Reach me directly at:

          Emily Jenson

          Expert Gearhead