Available with front or rear exhaust air motor, .4 Hp Extension Die Grinders run at 25,000 rpm and are suited for work within long pipes, castings, and other places where extended reach is needed. Straight-line air tools include safety-lock lever that prevents accidental start up. To minimize noise in workplace, tools run as low as 72 dB(A). Optional carbide burrs and mounted points enable deburring, grinding, etching, and cleaning.