Back Home / Tools and Equipment / Hand Tools / CHUCK KEY – SMALL MASTER, 1/4″- 1/2″ CHUCK KEY – SMALL MASTER, 1/4″- 1/2″ SKU: MCKS Categories: Hand Tools, Tools and Equipment Carbon steel master chuck key. Opens light duty 1/4″ to 1/2″ chucks. The squared center of the key opens acetylene tanks. Made from carbon steel. Carbon steel master chuck key. Opens light duty 1/4″ to 1/2″ chucks. The squared center of the key opens acetylene tanks. Made from carbon steel. Case Quantity: 1 Log In For Pricing