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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


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    • Yellow, 13.5in

    28 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?


    • Familiarity: I've used it several times

    You could make your own autoblock by forming a loop of cord with a double-fisherman's, but this loop is both much more convenient to work with (no bulky knot) and has just the right amount of stretch/spring for grip.

    Superb Backup

    • Familiarity: I've used it several times

    This is a great piece of gear for rappeling off sketchy overhangs and ice climbs. It gives you the piece of mind that if something ever happened, you're not gonna zip of the end of your lines.

    This thing will autoblock anything

      Honestly. Whatever you need this things got you. I use it as a back up for rappelling. The larger size works fine for both normal and extended rappel. That other guy isn't exaggerating about the pvc. Just tested on a wine bottle, also held extremely well.

      Why Not?

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

      I picked this up primarily for rapping off ice routes and ski descents, because I always feel a little antsy gripping skinny ropes with gloves on. It's a great backup, and I can see myself using it rock too, so I won't have to do the old rope-around-the-leg trick when freeing stuck gear.

      Essential piece of kit

      • Familiarity: I've put it through the wringer

      This lives on a locker at the back of my harness. It's a backup on every rappel and has largely replaced the prusik cords I've used in the past. Superior grip even on iced up ropes yet easy to manage on the descent. I lent mine to a ski buddy who didn't have a backup (hence the non-hollow block in the video) and they're sold on it.


      • Familiarity: I've put it through the wringer

      Such a great piece for an autoblock or third hand. Length is great, works with a variety of rope sizes (I have ropes from 7.5-10) and no issues. With a piece of cord, I have found that the knot can be big and cumbersome when tying an autoblock, but with this it is more streamlined. Try one out, you won't be disappointed.


      A must-have!

      • Familiarity: I've used it several times

      If you're a climber and looking to rappel (this applies to canyoneering too!), then you'll want this on your harness before you step over the edge. If you set these up as you're third hand, you can rappel with peace of mind. They are very, very grippy, so that can be both a blessing and a curse. If you're attached to the yellow color, don't be because these will quickly become brown from use. That is only aesthetic though, but just a forewarning!

      Pretty nice tool

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

      I've only used a hollow block a few times. But it is a very interesting way to descend from a climb. After tying a prusik on your brake hand end of the rope and you've attached it to yourself you're good to go. It acts as an auto lock on your repel, which enables you to clean gear and take both hands off the rope (sketchy!) or fix the rope that's been tied into a mess. It's a inexpensive piece of gear but can make a tough repel easier with a little peace of mind. I'd recommend this to any climber, or canyoneerer looking to up their safety.

      I prefer 6mm prusik cord

      • Familiarity: I've used it several times

      Although the Hollow Block works very well as a rappel back-up, it got dirty-looking very fast and did not shield my brake hand from heat build-up as well as my trusty, cheap 6mm prussik cord. The 13.5" length worked well for me.

      Perfect webbing

        I bought this for a prusik when rapping down icy or wet conditions when canyoneering. The cord is very sturdy, and the pre-sewn device makes it super easy to attach to the rope. That being said, this is very burly, and will definitely slow you down. I would definitely recommend figuring out if you need the 13" or 19" version, as the 13" is pretty short, and depending on your needs, you may want to consider the 19".

        don't leave the ground without it

        • Familiarity: I've used it several times

        Ties into a perfect Klemheist or Autoblock in about 10 seconds. Slides easily on two 10.1mm ropes, but grips tightly when you let it go.

        I set up my rappel device at the end of the first loop of a Sterling Chain Reactor, and connect my friction knot to a small locker attached to my belay loop. For that setup, I prefer the shorter (13.5") length. Long enough to get 3 turns, short enough there's no way it can jam my device.

        Really grippy, maybe too grippy

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

        I always use a prussik as a backup on my rappels, so I was excited to buy a dedicated piece of gear for that purpose. I ordered the 13" version, but I think I would have preferred the 19"; I should have measured my existing prussiks before ordering.
        The hollow block is definitely burly, and the bar tacks are strong - I never doubts its strength. It's also relatively easy to work with when wrapping the rope, although, again, I think I would have preferred the 19" version.
        The first time using it, I was rappelling on my 10.2mm rope, which I've had for a few years (it's slightly fuzzy, not too bad). I set the hollow block up as a prussik (rather than some other friction hitch), and I found it difficult to keep moving as I rappelled. I think this was a combination if it being too short, which kept the rope too close to the brake position, and too grippy, which made it difficult to slide smoothly.
        The second time I used it, it was on my friends 10.0 rope, which was less used. It was a lot more manageable this time around, and slid smoothly. However, neither time did it slide as nicely as my simple prussik made from 6mm accessory cord.
        All in all, I'll try using it some more (maybe it will "break in"), but my first instincts were to just go back to the cord I normally use.

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

        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


        How UV-stable is this aramid, compared to...

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