Made of high-speed steel material, stable and durable to use This drill set is suitable for most electric drills on the market today, and comes with a portable plastic box for easy storage and organization. Step drill bit and drill bit-milling cutter, 2 in 1 6 pieces/set suitable for lithium electric drill/hand electric drill/bench drill and other equipment. The surface of high-speed steel material is plated with titanium, which makes it have higher hardness and wear resistance, and double straight grooves make fast drilling and smooth chip removal. Universal round handle makes it suitable for a variety of devices and is more sturdy. Using high-speed steel to coat titanium on the surface to make it have higher hardness and wear resistance. The drill is designed with a 35° oblique edge, which is sharp and wear-resistant. The special serrated edge allows horizontal sawing after drilling. Universal round handle makes it suitable for a variety of devices. Suitable for cutting hard metals