Authentic Yoshida Tools Pneumatic Angle Grinder YA-4CH Series Model: YA-4CH-1 (Roll Type) YA-4CH-1F (Safety Lever) Wheel Size: 100 x 6 x 15 (15.8)mm Peripheral Speed (m/min): 4,300 Thorttle =Roll & Safety Lever Rotational Frequency (min-1): 13,500 Max Air Consumption: 0.68 Air Hose Size: 9.5 Air Inlet: RC3/8 Lightweight, powerful & durable Operation by open/close system silencer in cold environment Ideal for heavy grinding work such as shipbuilding & construction Made in Japan