The 9 Pce Combination Drill Bit Set includes 4 masonry and 5 high-speed steel drill bits. The masonry drill bits feature a tungsten carbide tip for drilling into bricks, tiles and concrete, in 8mm, 6.5mm, 6mm, 5.5mm sizes. The high-speed steel drill bits are general purpose bits designed for machine and handheld drilling into metal, wood and plastic. They come in 3/16", 5/32", 1/8", 3/32", 1/16" sizes.