This is a new old stock chrome finish, 10" size adjustable wrench replacement jaw. This one will fit the older adjustable 10" wrenches with the Diamond Calk & Horseshoe, and, or Diamond Tool markings. The thickness of the jaw at the very tip or smallest end of the tapered jaw is 3/8". This jaw is chrome plated, and is made to fit the chrome plated wrenches, but may fit others if the size and configuration is the same. We will be listing replacement parts for several sizes of adjustable wrenches, as well as other brands. Ask us if you have any questions.