Keyed padlock, concealed shackle weather resistant, opens with key 10g018, control key registration required no, key control no, shackle dia. 7/16 In, shackle height 3/4 in, shackle width 7/8 in, key type alike, shackle material boron alloy, body size width 2-5/8 in, body size thickness 1-5/16 in, body material steel, number of pins 5, hardened boron, silver, steel, weatherability some corrosion resistance, shackle configuration shrouded, heavy-duty high security pro series iron shroudedhigh- and standard-security weather-resistant padlocksshrouded padlocks offer superior resistance to cutting by minimizing shackle exposure. Covered 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.