The Master Lock No. 380D laminated padlock features a 1-9/16 inch (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 inch (7 mm) diameter shackle is 3/4 inch (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.