Rotary Tool, Voltage 12V DC, Max. Speed 32,000 RPM, Speed Setting Variable Speed, Collet Size 1/8 in, Brushless Motor No, Cordless Tool Kit Contents Bare Tool, Lock-Off Switch Yes, Lock-On Switch Yes, Switch Type Slide On Off with Speed Dial, Number of Speed Settings Continuous, Minimum Speed 5,000 RPM, Adjustable Collet Yes, Accessory Free Tool Change No, Accessory Kit Included No, Overall Length 9 in, Tool Weight 0.9 lb, Power Source Cordless, Number of Batteries Included 0