Padlock with key is best used for marine recreation, saltwater applications, offshore security environments and severe uses Key lock features a stainless-steel lock body and shackle for maximum strength and corrosion resistance Brass 4-pin tumbler and dual ball bearing locking mechanism provide maximum weather, pick and pry resistance 1-3/4 in. (44 mm) wide lock body; 5/16 in. (8 mm) diameter shackle with 2 in. (51 mm) length, 3/4 in. (19 mm) width; Extended shackle for application flexibility Includes three padlocks with two keys; Each key opens all padlocks