Talina Carlonwrote a review of Sterling Hollow Block - 6.8mm on June 30, 2019
Familiarity: I've used it several times
I bought the 13.5 inch hollow block and it is great! I connect it to my leg loop when repelling and wrap it around the rope twice and it stays in place with no worry at all. This is now a must have item whenever I sport/trad climb outside.