... before loading a bit3.Press shaft lock button, use the collet wrench to loosen the collet nut ... excess tightening of the collet nut and never use the damaged bit.4.There is an off ... as artificial nails Perfect for professional or home use Variable speed control: 3000 RPM up to ... : AC 100-240V EU 50/60HZDimension: 160mm x 24mm Multi use: carving, engraving, routing, grinding, sharpening, sanding, polishing ...