Sharp Chucks & Machines Ltd supplies Open Centre Power Chuck. Sharp Chucks & Machines Ltd is an ISO 9001: 2000 recognised company manufacturing a wide range of Lathe Chuck & Machine Tool Accessories for various industrial applications. The Open Centre Power Chuck comes with a set of Reversible Top hard Jaws, Soft Jaws and a piece of Allen Key. The Open Centre Power Chuck has a special key for stroke adjustment and is available in 2, 3 and 4 configurations.