Sunex Sx5201 1/4-Inch Mini Die Grinder 25,000 max. RPM of quiet speed Only 85 dBA Weighs only 0.9-Pound One year warranty Specificat ions: collet/pad size 1/4-Inch free speed 25,000 rpm, weight 0.9-Pound, length 6.1 -Inch ave air consumption 3 cfm, air inlet thread size 1/4-Inch npt, min hose size 3/8-Inch id, sound level 85 dba