[MULTI-SIZE]: 1pc 15-step drill bit (4-32mm), 1pc 9-step drill bit (4-20mm), 1pc 13-step drill bit (4-12mm). Three sizes are available to meet your needs. The package includes a nylon bag. [QUALITY MATERIALS]: Classic high-speed steel, titanium coating on the surface, proven performance and durability in drilling holes in plastics, wood, aluminum, copper, stainless steel and many other types of sheet metal. Titanium alloy drill bits are especially suitable for processing copper and aluminum parts / die steel / spring steel / cast iron parts / iron and other metal materials. [PRECISE POSITIONING DRILL BIT]: When pressing on the surface, it produces automatic, high-impact, spring-loaded striking force, and an adjustable hood can adjust the striking force. [Time-saving and labor-saving, efficient and fast]: The HSS taper drill bit is made of high-speed steel, which can reduce heat and friction, cool quickly, and automatically remove debris in the hole when drilling. The spiral design can prevent slippage, making drilling easier and more efficient. [LASER ENGRAVING]: The size is laser engraved into the metal, so it won't wear out even if reused, making precise drilling easier. Titanium Coated Tip, 4-12/4-20/4-32mm Wide, Super High Speed Steel, Spiral 1. If you need a very satisfactory step-by-step drill, stop by, this is what you need. 2. The drill bit is made of HSS high speed steel and titanium alloy coating, which is durable. 3. It is very suitable for drilling steel, brass, wood, plastic, iron sheet, aluminum, insulation board, PVC and other materials. Widely used and interested: 1. Compatible models, bench drills, hand drills, rechargeable drills. 2. The cone is suitable for drilling larger and deeper holes or widening the opening of the drilling area. 3. The cutting blade design allows for faster cutting and automatically removes the hole when drilling. SPIRAL DESIGN The double spiral blade design makes cutting faster and easier, and when the drill bit is drilled, the stepped tool automatically removes burrs from the hole. The kit can cut wood, sheet metal, steel and other surfaces. Delivery quantity: 3 pieces