ITEM NAME:20 Pcs Twist Drill Bits for Ceramic Tile Marble Glass Drilling,6mm and 8mm Description: YG8 hard alloy drill bit, well abrasive resistant. Double helical U-shape chip groove designed,making chip removal more smoothly. Triangle handle design for avoiding dropping. Compatible with electric hand drill, Lithium electric drill and bench drilling machine. Application: ceramic tile, concrete, iron, copper, plastic, wood board, etc Specification: Color: Orange Material: hard alloy Size: 6mm(1/4 inch): Drill Bit Diameter: 6mm Shank Diameter: Approx. 4mm / 0.15 inch Drill Total Length: Approx. 100mm / 4 inch 8mm(1/3 inch): Drill Bit Diameter: 8mm Shank Diameter: Approx. 6mm / 0.23 inch Drill Total Length: Approx. 115mm / 4.53 inch Package Includes: 10 Pieces 6mm Twist Drill Bit 10 Pieces 8mm Twist Drill Bit Note: 1.Please allow a slight difference between the size from the above and the actual item due to manual measurement. 2.Due to the difference between different monitors,there could be a little color difference acceptable, please kindly note..Application: ceramic tile, concrete, iron, copper, plastic, wood board, etc. Compatible with electric hand drill, Lithium electric drill and bench drilling machine. 10 Pieces 6mm Twist Drill Bit. 10 Pieces 8mm Twist Drill Bit.