Features 1、Premium Boart: These glass drill bits are made from premium boart material, which ensures hardness and durability. 2、Wide Application: These glass drill bits are applicable to marble, ceramic tiles, wall and other material. 3、Low Resistance: These glass drill bits adopt larger chip removal opening design for lower drilling resistance. 4、High Torsion: These glass drill bits provides high torsion to achieve excellent cutting strength and performance. 5、High Efficiency: These glass drill bits ensure fast drilling speed and stable performance, the hole is round without breach. Specification Item Type: Tile Drill Bits Material: Boart Opening Diameter: Approx. 40mm / 1.57in Handle Shape: Round Handle Application: Glass, Ceramic Tile, Stone, Floor Tile, Marble, Etc Package List 2 x Tile Drill Bits