Extended Air Angle Grinder, Industrial DutyFree Speed 18000 rpm, Wheel Dia. 3 In., Spindle Size 3/8 In.-24, 1 HP, 7.5 Average CFM @ 15 Second Run Time, 30 CFM @ Full Load, Air Inlet 3/8 In. NPT, Required Pressure 90 psi, Min. Hose Size 3/8 In., Overall Length 11 In., Cast Aluminium with Rubber Grip Handle Material, Variable Speed Yes, Rear Exhaust, Lever Throttle, Yes Lock, Includes Wheel Guard, Flange, Nut and Wheel Nut Wrenches Industrial-Duty Type 1 Wheel/Cone and Plug Wheel Grinders1TDG1, 3Y527, and 3Y503 all use Type 1 grinding wheels; see page 3752. 3Y526 uses cone and plug wheels.