The Systec ( formerly ONCA ) self contained pneumatic power chuck features excellent rigidity and durability. The chucks feature fast clamp and unclamp times. They are available in a 2, 3, or 4 jaw version. All sizes are available with inch or metric serrations. The bodies are steel that have been hardened to a 62 hrc and precision ground. Internal safety valves prevent the loss of air pressure and grip force. Five sizes are available up to 12 inches in diameter to meet you application requirements.