The Master Lock No. 380C Laminated Padlocks feature a 1-9/16� (40 mm) wide laminated steel body for maximum strength and reliability. The Rust-Oleum Certified finish provides a lifetime guarantee against rusting on the lock body. The 9/32� (7 mm) diameter shackle is 1-1/8" (19 mm) long and made of hardened steel, offering extra resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide resistance against prying and hammering.