1. Simple Assemble, easy use, low price with high quality; 2. Good Tool for to DIY their own handcraft, can be using drill on woods, aluminum,PCB,Acrylic board, plastic, etc; 3. Universal keyless chuck allows you quickly and easily change accessory bits on your Grinder; 1. About Motor: Rated voltage - 12 volts DC Motor run on DC voltage from 3-12 volts No load speed 18000-35000 RPM No load current - 1A. shaft diameter:2.3mm 2. About Golden chuck with 5pcs collet: Type:High precision Drill Collet Size: 0.5mm, 1.0mm, 1.2mm, 1.5mm,1.8mm,2.0mm, 2.4mm, 3.0mm,3.2mm Diameter of backshaft (match the motor shaft): 2.3mm 3. About Twist Drill Bits: Design: Straight Shank Diameter: 0.5/0.8/1.0/1.2/1.5/1.8/2.0/2.3/2.6/3.0mm(each size one pcs) Colour:silver Material:Metal Package Contents: 1 x Motor 1 x Golden chuck with 5pcs collets 1 x Small wrench 10 x Twist Drill Bits Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.