Keyed Padlock, BumpStop, Shackle Dia. 5/16 In., Shackle Height 1-13/16 In., Shackle Width 29/32 In., Key Type Different, Shackle Material Boron Alloy, Body Size Width 1-3/4 In., Body Size Thickness 1 In., Body Material Brass, Number of Pins 5, Rectangular, Brass, Weatherability Superior Corrosion Resistance, Shackle Configuration Open, High Security Brass PadlocksInclude 2 keysPro Series Solid BrassBumpStop feature stops the transfer of force from the bump key to the pins, preventing rotation of the cylinder so the padlock remains locked. Solid brass body and brass cylinder. Replaceable hardened boron alloy shackle has dual ball-bearing locking mechanism. Rekeyable cylinder provides tens of thousands of key changes.