Keyed Padlock, BumpStop, Shackle Dia. 5/16 In., Shackle Height 1-1/8 In., Shackle Width 7/8 In., Key Type Different, Shackle Material Boron Alloy, Body Size Width 2-1/8 In., Body Size Thickness 1 In., Body Material Steel, Number of Pins 5, Rectangular, Black, Weatherability Superior Corrosion Resistance, Shackle Configuration Open, High Security High- and Standard-Security Weather-Resistant PadlocksCovered padlocks withstand harsh weather and corrosive environments. 2 brass keys included. Models with BumpStop technology stop the transfer of force from the bump key to the pins, preventing rotation of the cylinder so the padlock remains locked.Pro Series Weather Tough Laminated SteelPadlocks have chrome rustproofing for strength and longer life. Rekeyable cylinders provide tens of thousands of key changes.