High Performance: This 1/4" air die grinder could provide no-load speed up to 25000 rpm. Operating pressure: 90 psi ; Air consumption: 85.5L/min. And the rear exhaust design could direct air away from the work surface, improve work efficiency Easy to Use: This mini pneumatic straight grinder designed with the partially rubberized housing for comfortable grip. And it only weighs 0.33 kg, perfect for one-handed operation and easier to access to narrow places Safety Design: The safety lock-off design could prevents accidental starting of the tool for safer use Wide Application: Equipped with 3 mm collet and 6 mm collet which can match a variety of accessories and deal with different surfaces flexibly. This air die grinder is perfect for grinding, deburring, polishing etc Package Contents: 1 x air die grinder; 1 x 3 mm collet; 1 x 6 mm collet; 1 x compressed air connection; 1 x 17 mm chuck key; 1 x 11 mm chuck key; 1 x empty oil bottle, Manufacturer: Hangzhou Great Star Industrial Co.,LTD.