Adjustable Concentricity screws permit adjusting to 0.0005" TIR. Internal stops eliminate length changes due to drawback. Foot or hand valve frees hands for efficient part handling. Special air union permits spindle speeds to 3500 rpm. Heat is not generated in the "Air Collet Chuck" due to external mounting of air union.

Collet sticking is eliminated by spring-loaded piston. Shop air pressure activates large piston, closing the collet. The piston is spring-loaded and returns when air pressure is exhausted.