These tiny nuts are a compound of copper and iron machined to offset wedges and swaged with a patented technology that Black Diamond claims is strong, flexible and not prone to fraying. These are the next-generation RP. After a few trips up The Health Issue, a new granite 5.11 close to the office, I was impressed by the nuts’ durability. Alloys usually dent and scratch pretty quickly, but the Micro Stoppers held up to some yanking, though (thankfully) no falls.
I really like the shape of the offset, which BD touts as optimized for pin scars. I found two natural seams on the route where the offset shape fit when a regular tapered steel nut didn’t.
- Copper/iron alloy in offset design provides excellent bite and strength.
- Sizes 1 and 2 are for direct aid only.
- Rated strengths (pounds): Size #1 – 440; 2 ± 660; 3 – 1,100; 4 – 1,320; 5 – 1,320; 6 – 1,760