Specification Collet: 3.175mm Spindle motor: new DC motor Operating voltage 12-48VDC Power: 300W Speed :3000-12000r / min. (12V-3000 transfer, 24V-6000 transfer, 36V-9000 transfer, 48V-12000 rpm) Torque: 230mN.m Insulation resistance:> 2 megohm Dielectric strength: 400V Diameter: 52mm Chuck some length: Arbor parts of 35mm (contains nuts and sandwich-43mm) Part of the chuck diameter: 16mm Motor total length: 180mm (includes gripping parts and motor) The spindle runout of about 0.01-0.04. Can be used for engraving metal or nonmetal materials. Packing List: 1 * 300W Spindle motor