ruhitools 3 pcs HSS Steel Step Drill Bit Set 4-12mm/4-20mm/4-32mm , Hex Shank for Wood, Sheet Metal, Stainless Steel 3 pcs HSS Steel Step Drill Bit Set 4-12mm/4-20mm/4-32mm , Hex Shank for Wood, Sheet Metal, Stainless Steel

Create perfect holes in any material Quickly and Easily! You can achieve one-time processing of large holes, no need to replace the drill bit and positioning hole. You can use these to drill holes to any materials. Work on plastic, woods, and most metals, including steel, brass, aluminum, and copper. The shanks are small enough that they should fit any standard size chuck such as that on a small drill press or hand-held drill. The drill bits are made of drop forged, heat-treated and fully polish classic high-speed steel with titanium coating for proven capability and durability. HSS STEEL CONSTRUCTION: High-speed steel construction for longer cutting edge life even at extreme temperatures. TITANIUM COATING: Coated by titanium, this step drill set performs well in heat, corrosion and rust resistance. AUTOMATIC CENTER PUNCH: Delivers an automatic, high-impact, spring-loaded strike when pressed against the surface, adjustable cap regulates striking force.