Beauty Star 1Set DIY Mini CNC 300w DC Spindle Motor + 52MM Clamp + 110V Power Converter + 13 PCS ER11 Collect Air Cooled Spindle; Size: 52mm; Power: 300W; Voltage: 48V DC High precision spindle run out 0.01-0.03; Speed: Up to idle up to 10000 rev / min Maximum Torque: 0.23N.m; Comes with ER11 collect+mount+speed governor. Applied to Lathes, Mills, Car Hoists, Pumps & Conveyors, etc Stiving for 100% service satisfactory. Any issue please contact us, we would always try our best to help you.