The Automatic Gem Drill is ideal for cutting soft stones and glass. A 1/50hp 115V, 60Hz motor runs at 3000rpm and drives the drill. It uses an electronic feed which mechanically raises and lowers the drill chuck 1/4". The light pressure of the feed prevents damage to diamond coated drill bits, but results in a much longer drilling time. Drill Tubes and 180 Boron Carbide Grit are a low cost alternative to diamond drill bits for this unit. Plastic Putty can hold the work piece. The putty can also serve as a dam to hold grit around a drill tube. This unit comes complete with 1/4" Jacobs chuck, two (2) 1-1/2mm and two (2) 2mm diamond drill bits, plastic putty, instructions, and product guarantee. This item is not available in 220V, 50Hz but can be used with a voltage transformer.