About This 【3-Pc Spiral Flute Step Drill Bit Set - Widest Range! 1/8" to 1-1/8" Coverage】: Most 3-pc step drill sets max out at 7/8". Our set features 3 bits drilling 29 precise hole sizes, from fine 1/8" (3.175mm) up to a powerful 1-1/8" (28.575mm). Set includes 3 precision-ground step bits providing 29 standard hole diameters:6-Size Bit: 3/16", 1/4", 5/16" , 3/8", 7/16", 1/2"; 10-Size Bit: 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/8"; 13-Size Bit: 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 15/32", 1/2". Tackle diverse drilling tasks with one set – save time and hassle! 【Premium Build: Industrial M35 Cobalt Steel & TiAlN Coating】: Made from high-performance M35 Cobalt HSS (ISI M35/1.3243/SKH55/M35), offering superior wear resistance, pressure tolerance & sinter resistance – powers through tough materials like stainless steel. The TiAlN coating (AlTiN) boasts extreme hardness (~3800HV), high heat resistance (up to 800°C oxidation temp), and low friction, dramatically extending bit life and ensuring smoother, faster drilling. 【4 Spiral Flutes: Unbeatable Stability & 2X Life】: Stop the flex! The unique 4-flute design delivers exceptional rigidity and stability for greater precision and speed. Superior chip clearance minimizes jams and heat build-up. Excel at stainless steel drilling. Lasts up to 2X longer than standard step drills! 【Optimized Cutting Angles & Pro Cooling Tip】: Engineered cutting angles reduce self-wear. Pro Tip: Bits heat up during continuous high-speed drilling. Using cutting fluid or coolant spray is highly recommended for effective cooling, maximizing bit lifespan. 【Superior Performance】: KJE Step Bits feature jam-free performance: The dual-flute design delivers up to 2X faster drilling, 4X longer life, and 50% more holes per bit vs competitors! Ideal for stainless steel, aluminum, wood, and plastic sheet (thinner than step height). Industrial-grade reliability for professionals and DIYers. Overview Material : Cobalt High-Speed Steel Finish Type : Titanium Aluminum Nitride Shank Type : Hex Brand : KJE Tool Flute Type : Spiral
