This set of Milwaukee Step Drill Bits includes four different sizes: 48-89-9249, 48-89-9209, 48-89-9204, and 48-89-9201 (sizes #4 and #9). These bits are made of sturdy metal and are suitable for cutting through a variety of materials with a drill. The bits are designed with the user in mind and can be used for various applications such as DIY projects, woodworking, and metalworking. The gray color and the SHOCKWAVE model name make these bits easy to identify among other drill bits. Get your hands on this high-quality set of Milwaukee Step Drill Bits and take your drilling projects to the next level!