Incredible durability and anyone who needs to fasten materials to masonry work should use these. Used a 300 to attach a sub deck to a concrete slab and only had 1 latch. At the end of my project, I found that about 70 was too short for me, so I grabbed a box of Tapcons to finish the job quickly, and of the 70 I screwed in, 15 popped. I'd easily double that number if I wouldn't catch the rest by moving very slowly. Whatever Snug does, they have to keep doing it because they're doing it just right.