3PCS Spiral Grooved Step Drill Bit, 4-12/20/32mm Milling Cutter, High Speed Steel (HSS) Titanium Coated Step Drill Bit for Drilling in Steel, Brass, Wood

【MULTI-SIZE】: 1 pc 15-step drill bit (4-32 mm), 1 pc 9-step drill bit (4-20 mm), 1 pc 13-step drill bit (4-12 mm). Three sizes are available to meet your needs. The package includes a nylon bag.

【QUALITY MATERIALS】: Classic high-speed steel with a titanium coating on the surface, offering proven performance and durability for drilling holes in plastics, wood, aluminum, copper, stainless steel, and many other types of sheet metal.

【PRECISION POSITIONING DRILL BIT】: When pressed against the surface, it produces an automatic, high-impact, spring-loaded striking force, and an adjustable cap allows you to regulate the striking force.

【TIME AND LABOR SAVING, EFFICIENT AND FAST】: The HSS conical drill bit is made of high-speed steel, which can reduce heat and friction, cool down quickly, and automatically remove debris from the hole during drilling. The spiral design prevents slippage, making drilling easier and more efficient. [LASER ENGRAVING]: The size is laser engraved into the metal, so it won't wear down even with repeated use, facilitating precise drilling.