Features a 2 inch (51 mm) wide zinc solid body for strength and reliability. 3/8 inch (10 mm) diameter octagonal shackle is 1-1/2 inch (38 mm) long and made of inchtough-cut inch boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. roller pin cylinder provides maximum pick and pry resistance. hinged dial cover and shackle seal offers excellent weather protection and reinforced body bumper protects against scratches. the lock includes set your own combination convenience, without the need for a reset tool.