Electric Mini Drill Grinder Set Engraving Pen Mini Drill Electric Rotary Tool Grinding Machine Accessories DIY Kit Set Hand Metalworking Drilling Machine Polishing Voltage: 220V,50/60hz Power: 130W Speed: rpm S Different Speeds Collet Dia: 3.0mm ( use for 3.0--3.2mm shank ) Application:jewelry, home, and wood making Function :For Wood Metal Ceramic Plastic Drilling Polishing Grinding Carving Shaping and Sanding.