The Master Lock Magnum M40NUMEC stainless steel discus padlock features a 2-3/4 in. wide body for strength, reliability and corrosion resistance. The 3/8 in. diameter octagonal shackle is 5/8 in. long and made of Tough-Cut boron-carbide, 50 percent harder than hardened steel, offering maximum resistance to cutting and sawing. The reinforced body bumper protects against scratches. The lock includes set-your-own combination convenience and a 4-pin cylinder for increased pick-resistance. This padlock is ideal for self storage units, sheds, trailers, moving trucks, vans and more.