51731 Precision deburring & grinding. Excellent for use on tooling, dies, molds, production parts and more. Polishing, etching, wax forming, routing, bevelling, dulling, shaping, flash removal, and trimming & cutting CNC machining. Ceramic bearings provide better performance and durability with regard to high shaft speeds, dirt, extreme temperature, corrosion and other environmental factors. High-speed air motor, controlled with patented governor, provides constant speed under load. Precision, high-tolerance, low run-out collet. Specifications: 1/4" NPT air inlet. 0.1hp motor. Rear exhaust. 3mm collet. Overall length: 133mm. Noise level: 69dB(A). No load speed: 60,000rpm.