product performance parameters 1 grinding/mill diameter: Φ2-Φ13mm 2 point angle: 90 °-145° 3 Power Supply: AC 220V / 50Hz(for 110V system,we suggest you can prepare a 110 to 220 voltage converter) 4 Power: 0.25KW 5 speed: 5300r/min 6 Diamond grinder wheel: diamond wheel diamond CBN230# (for white steel      material drill only) 7 Collet Range: ER20  Φ3-Φ13mm,total 11pcs 8 Dimensions: 242(L) × 127 (W) × 127 (H) mm 9 Weight:12Kg It has such parts: Standard ER20 collet  11pcs( Φ3-Φ13mm) Collet Holder      1set(next to the red power switch) Hexagon Wrench  1 set Power cord  1pcs   Optional grinder wheels for carbide tungsten material drill bits(if need,please contact with us timely!)