Proxxon IB/E Precision Drill/Grinder is ideal for mechanics, model builders, jewellers, opticians, artisits and electronic enthusiasts and can be used for prolonged periods when drilling, milling, grinding, polishing, cleaning, cutting,engraving and signing. The high-revving low noise 100W motor has full-wave variable speed control for speeds between 5,000 and 20,000rpm. The head is made from die-cast aluminium for exact bearing seats and optimal stability. Proxxon IB/E comes complete with 34 high quality bits and cutters, 6 triple slit, high concentricity steel collets and supplied in a strong plastic storage case. W X 40MM H X 40MM L X 230 MM WEIGHT 640GMS 6 triple slit collet can be found in the machine The largest mop or wheel this will accommodate would be 22mm in diameter.