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6.8mm Hollow Block

5 out of 5 stars
2 Reviews

Out of Stock

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6.8mm Hollow Block

Built from Sterling's RIT 900 cord, the Hollow Block 6.8mm 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.


  • Pre-sewn prusik serves on any climb
  • Technora fiber increases abrasion-resistance and overall durability
  • For use as a prusik or Klemheist knot on ropes
  • Item #STE0040
13in, 19in
Recommended Use
climbing, rescue
Manufacturer Warranty

Overall Rating

5 based on 2 ratings

Review Summary

1 Stars - 0 reviews
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5 Stars - 2 reviews

Fits True To Size

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5 out of 5 stars

November 19, 2021

So much Friction!

I've put it through the wringer

Well, this is intended for friction hitches and it works a treat. Whether you are tying a prusik, Klemheist, Autoblock - you name it this sling will grab your rope. I have used these for years and they usually age out before I wear them out. The biggest trick is practicing with your rope so you know how many wraps to throw on the friction hitch. Too many and you ain't goin' anywhere. Super safe, but can be a beast to release.

Alexander T
5 out of 5 stars

March 28, 2021

Almost too good...

I've used it once or twice and have initial impressions
5' 11"

I used this for the first time recently as a part of my rescue rig for military rappelling. I was looking for something with less bulk and quicker setup than a tubular nylon webbing autoblock. I'm glad that I tested it out first before needing it in an actual rescue setting. I used a klemheist with four wraps, and got stuck about four feet down into my rappel. The hollow block locked up so tight onto the main rope (Bluewater 11mm Assaultline) that there was no budging it at all. I had to tie in a secondary autoblock with a sewn runner and release the klemheist from the carabiner just to continue. Three wraps is enough!

Jeremy B