Oneway Stronghold Chuck Complete is and beefiest of Oneway's scroll type chucks, favored by world-class turners for its smooth one-hand setup and vibration- running. This precision-made chuck super holding power and is suitable for both square and round work. I for creating large bowls, vessels, and other specialty turnings, it delivers a joyful and reliable user experience. The Stronghold Basic Set includes the chuck body, #2 jaws, a geared chuck key, a 1-1/2" jumbo woodworm screw, and a T-handle hex key. The #2 jaws provide an external (compression) chucking capacity of 1-3/4" to 3-1/4" and an internal (expansion) capacity of 2-3/8" to 4". Weighing 8 lbs, this chuck requires taper lock adapters to attach to your lathe, which are sold separately, so be sure to order the correct adapter for your lathe when purchasing. Model Number: 2137