... for carver, engrave, rout. Grind, sharpen, sand, polish, drill and more 2. Unplug the tool form electric outlet before ... collet wrench to loosen the collet nut. Insert the bit, and tighten the collet securely,. But avoid excess ... of the collet nut and never use the damaged bit.4.There is an off/on switch. When ... speed control: 3000 RPM up to 20,000 RPMCollets type: 2.4mm or 3.2mm Voltage: AC 100-240V ...