Stainless-steel lock body and inner mechanism for maximum corrosion protection Hardened chrome moly shackle Top-quality weld seam (maximum depth of welding gives high tensile strength) Anti-pick mushroom pins Hardened steel drill plate protects keyway 5-pin cylinder 140 Series hasp recommended 24/70RK (Rekeyable Diskus) can key to any 26 series Add $.80 for keyed-alike option Add $4.00 for master-keyed option (your 1st order comes with 1 free master key.