Smooth-running ball-bearing motor is designed for a long service life. Variable speed: *****0 RPM Reversible Keyless chuck Built-in level Belt clip Heat treated gears **0V, 3.1 amps; Speed: *****0 RPM; Chuck capacity: 3/*4**9;**9; to 3/8**9;**9;; Double insulated; UL listed; Overall dimensions: **1/2**9;**9;L x **1/2**9;**9;W x 7**9;**9;H;