10-45mm Step Drill Bit HSS Cobalt Step Stepped Nitrogen Spiral Step Cone Metal Cutter Metal Cone Triangle Shank Hole Drill Tools

Tool using: pistol drill, bench drill. Water to make ti cool while working, it can effectively extend the service life. Recommended drilling speed 250--400 rpm Suit for use in hardness under 25 artifacts(Such as iron, steel, PVC panels, wood board ,Do not fit for cutting Stainless steel) , The plate thickness under 5mm

• Professional: Cobalt step stepped is made of high-quality stainless steel, which is durable and has a long service life.
• it can not easily be broken.High-speed steel step drill, nice quality and durable. These drill bits works great in making a smooth, clean and perfectly round hole.
• Effortless install: Our step stepped stainless steel cone cutter is easy to install and use. it can be easily installed on any surface, such as wood, tile, metal, etc.
• The step drill bit is made from upgraded high speed steel characterized by well-balanced toughness, wear resistance and red hardness properties for better and faster hole -drilling performance. The coating makes the drill bit more durable so that it can last for years with uncompromised quality.
• Surface Treatment:nitrogen treatment (increasing the hardness and abrasion resist.Material: HSS 4241.8 stepped:10,15,20,25,30,35,40,45MM