Boltmasters Glass & tile Drills have been designed to drill Glass,  Plastics, Class 3 Ceramic Tiles, Fibreglass & Brick.  With a 4 facet diamond spear point design shaves rather than cuts for improved precision and penetration.  Stronger carbide tip with copper brazing has better heat resistance and provides 7 times longer life.  Spiral flute aids dust extraction and reduces heat build up for 30% faster drilling.  Longer total length than standard tile bits for deeper drilling.  Parallel Shank to suit non-hammer action portable power drills