20PC HSS Twist Drill Bit Set High Speed Bits Rotary Tool Dremel Compatable 20 Piece Diamond Coated Drill Bit Set: This 20 piece drill bit set includes bits ranging in gauges #61 to 80. The bits are diamond coated giving the extra strength and stability to withstand tough jobs. Each bit has a grit of 200 The set comes in a plastic storage case that indicates the sizes of each bit Used in drilling holes in glass, marbles, tile, stone, and many other materials Push Drill with 2 Collets: This is a new manual push drill comes with 2 collets measuring 1mm and 2mm. The spiral and chuck are made of steel and the body is plastic. Comes in a PVC pouch Measurements: 7 1/4" in length