Solid body locks provide maximum protection. Fully comply with U.S. Government standards AA59486 and AA59487. Bumpstop Advanced Cylinder Technology resists tampering from lock-bumping attacks. Five-pin cylinder for pick resistance. Re-keyable cylinder provides tens of thousands of key changes. Solid brass, SPEC CID AA-59486-1IB4S, set size 4, 2 master keys, chain, shackle height 1".