GREENER Conical Drill Bit Hole Opener for Metal Stainless Steel Reamer High Hardness Cone [4-20]

Made with cobalt nitride and M35 high-hardness nitrided steel.

Nitriding treatment enhances surface hardness, wear resistance, fatigue resistance, corrosion resistance, and high-temperature resistance.

Hardened and sharpened for superior cutting performance and durability.

Step drill design with 15 size steps allowing flexible hole diameters from 3mm up to 32mm.

Hexagonal shank for secure grip and compatibility with various drilling machines including electric drills, bench drills, and screwdrivers.

Reinforced shank to prevent breakage.

Platinum color ring for easy identification of drill size.

Spiral groove design for efficient chip removal.

Suitable for drilling various metals including stainless steel (304), aluminum alloy, color steel sheets, steel plates, cast iron, and copper plates.