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Makes a great team when paired with the 3/8" Zwitter glue-in bolt (we sell them together to save you some $//£). Kinda like Peanut butter & Jelly, Jordan & Pippen, Cheetos & Split Pea Soup.
These are the way to go in soft rock (limestone, sandstone), check out what the ASCA says about them: http://www.safeclimbing.org/education/adhesivebolts.htm
along with their rated strength:
2000psi concrete- Shear= 11,655lbs (52.4kN); 4000psi concrete- Shear= 11,655lbs (52.4kN)
BOLTS MUST BE SPUN WHILE BEING DRIVEN INTO THE CAPSULE/HOLE TO ENSURE PROPER MIXING/CURING, (preferably with a rotary hammer).
Capsules are 3.75" (95mm) long. 2 year shelf life if kept in a dark, cool location.