Generic 105Pcs Cutting Grinding Electric Polishing Engraving Drill Bits Rotary Set 105 PCS Accessory Set electric grinding / grinding and polishing cutting.The mental shank diameter of the product is 1/8 "(3.17mm),weight 140g Rotary file (MILLS)is fit for sanding wood engraving plastic Silicon wheel is fit for grinding glass porcelain Double mesh cutting disc is fit for cutting metal and other dual mesh materials Resin cutting discs is fit for cutting steel and other metals such as chassis steel Sandpaper laps is fit for sanding wood but must match with rubber connecting shaft Rubber laps connecting shaft is match with Sandpaper laps Wire brush is for rusting metal wipe of surface Polished cotton is for a wide range of polishing porcelain jade Polishing wax is enhanced bright effect Grinding is for grinding metal burrs millstone is for polishing shape Electrical grinding connecting rod is before installing on the electric grinding you must installate it on the blade Polished Cotton connecting rod is install the polished cotton