Blunt Nose Diamond Drill Bits work with any drill - just add water for lubrication. Glastar brand Diamond Drill Bits are much easier and safer to use than old-fashioned spear point steel drills and don't chip the work material.
Blunt Nose Diamond Drill Bits are basically glass drill bits for use primarily to drill glass, stained glass, china plates or fiberglass. The solid point bits are not designed for drilling ceramic or porcelain tile, floor tile, limestone, slate, marble, granite or other stones. Glastar Blunt Nose Drill Bits are designed to be used at high speeds up to 10,000 rpm.
Since Blunt Nose bits have a solid rounded tip, they are slightly easier to start when drilling on a curved surface, such as a bottle, when compared to using a Core drill bit, above. However, since Blunt Nose bits drill out the complete hole, they also drill more slowly than the Core bits and they are generally not used on the super hard abrasive materials such as ceramic or porcelain tile, floor tile, limestone, slate, marble, granite or other stones. Blunt nose bits are available in three sizes, 1/8", 1/4" and 3/8". Core drill bits are resommended for drilling in these materials ans are available from 1/8" to 4" in the section, above