1-3/4" magnum padlock. Magnum 1-3/4" wide laminated padlock. Tough-cut octagonal boron-carbide shackle. Dual ball bearing locking for maximum pry-resistance. Dual-armor protection, laminated steel core for strength, stainless steel and zinc outer components for weather-resistance. 4-pin cylinder for increased pick-resistance. Reinforced body bumper for scratch-resistance. Shackle dimensions: 1" L. x 13/16" W. x 5/16" diameter boron-shackle. 1-3/4"