Professional grinder kit giving complete flexibility for most grinding and polishing needs. Quick chuck design, chuck can be quickly converted between 3mm-6mm(1/4inch-1/8inch). aluminum alloy housing, high quality and long service life. Comfortable ergonomic design, suitable for hand-held homework. Quality bearings for smooth and powerful operation, high accuracy. Product Name:Engraving Tool Polishing Machine for Pneumatic Tools R.P.M: 25000RPM Air Consumption: 80L/Min Chuck Size: 1/4inch(6mm),1/8in(3mm) Air Inlet(P.T): 1/4inch Working Air Pressure: 6.2bar Exhaust: Rear Lock-off throttle to prevent accidental start up, safe to use. Supplied with spanner and adapter for easily operate. Widely used in all kinds of mold, hardware products, glass, stone, handicrafts, ornaments and industry need blank shaping, cutting, grinding and finishing homework. Color:As Shown Material:Metal Package Contents: 1 * Polishing machine kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.