3-piece set of spiral step drill bits, 4-12/20/32 mm milling cutters, HSS step drill bits with titanium coating for drilling in steel, brass and wood

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

【HIGH-QUALITY MATERIALS】: Classic HSS drill bits with titanium coating offer proven performance and durability when drilling holes in plastic, wood, aluminum, copper, stainless steel, and many other types of sheet metal.

【PRECISE POSITIONING DRILL BIT】: Upon contact with the surface, the drill bit automatically generates high impact force through spring action. The impact force can be regulated via an adjustable cap. 【TIME AND LABOR SAVING, EFFICIENT AND FAST】: The HSS conical drill bit is made of high-speed steel, which reduces heat and friction, allows it to cool down quickly, and automatically removes drill chips from the hole during drilling. The spiral design prevents slippage and facilitates and optimizes drilling. [LASER ENGRAVING]: The size is laser-engraved into the metal, so it won't wear off even with repeated use and allows for precise drilling.