30 Piece HSS Mini Drill Bit Set to fit all makes of rotary tools., High Speed Steel. Sizes: 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.35 and 3.0mm diameter. For precision drilling in smaller workpieces, including wood, plastics, perspex, circuit board and