TruGuard, 1-9/16", 40 mm wide, laminated steel padlock with thermoplastic cover for weather resistance, 2" long hardened steel shackle for resistance to cutting & sawing, shackle dimensions 5/16" shackle diameter, 2" height, 13/16" width, uses master lock key blank k1 box or ilco m1-1092 tv #182-444.