The Excell M15BEURDLFAU Laminated Padlock features a 64mm wide laminated steel body for maximum strength and reliability, and is surrounded by brass and zinc outer components for weather resistance. The 11mm diameter octagonal shackle is 38mm long and made of Tough-Cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. The 4-pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering.