Step Drill Bit Set for Stainless Steel, 2-Piece Set, Hex Shank, Titanium Coated

【HRC89 Hardness】This step drill bit is made of HSS-Co M35 steel with a titanium nitride coating on the surface, achieving a hardness of HRC89. It offers superior sharpness compared to ordinary steel step drill bits. It is wear-resistant and heat-resistant, reducing heat generated during friction.
【For Stainless Steel】An indispensable tool for drilling holes in stainless steel, iron plates, aluminum plates, wood, vinyl, resin, etc., as well as for home DIY, enlarging pilot holes, chamfering, and deburring. It's a must-have item for home and work.
【Industrial Grade TiAIN Coating】The TiAIN titanium nitride coating increases surface hardness to 89 degrees, allowing it to withstand high-speed rotation loads. It forms a hard protective layer of Al2O3 during drilling, improving the drill's high-temperature resistance and grinding resistance, making it ideal for high-speed drilling.
【Wide Application】High stability and long lifespan are key features! Step drill bits gradually enlarge holes from small to large, allowing for drilling multiple hole sizes and correcting hole sizes. The hexagonal shank allows for use with impact drivers, electric drills, and cordless drills.
【Set of 2】: 4-12mm (9 steps: 4, 5, 6, 7, 8, 9, 10, 11, 12mm). 4-20mm (9 steps: 4, 6, 8, 10, 12, 14, 16, 18, 20mm). Includes a storage case for the step drill bits.