The material selection of twist drill mainly depends on the application and material type, generally divided into high-speed steel, carbon steel and tungsten steel. HSS is good for harder metals and woods, while carbon steel is better for thinner materials like softwoods and plain steel. Tungsten steel twist drills can be used to drill deep and long holes and drill high-quality alloy steel and ceramics with high hardness. Pay attention to the following points when using twist drills: 1. Select the appropriate twist drill: select the appropriate twist drill according to different materials and drilling diameters. 2. Pre-drilling treatment: prepare a suitable drilling template, and perform characterization, measurement and marking as required. 3. Use the correct cutting fluid: choose the appropriate cutting fluid according to the drilling material to ensure that the drill bit works in the best condition and prevent excessive wear. 4. Strengthen safety protection: Wear appropriate protective equipment such as protective gloves and goggles during drilling to avoid eye and hand injuries. At the same time, it is also necessary to pay attention to safety factors such as the power supply and wires of the electric drill.