OSTTE 5PCS Step Drill Bit Set with Two Spiral Grooves, 50 Sizes (3/16" to 1-3/8") HSS Titanium Coated Step Bits for Metal, Aluminum, Wood & Plastic - with Aluminum Case for Electricians & DIY

【50 Sizes in 5 Bits】One versatile step drill bit set gives you 50 essential hole sizes (3/16" to 1-3/8") for any project. Perfect as a step drill bit set for metal, wood, plastic and more - no more searching through bulky collections

【Titanium-Coated HSS - Drills Harder, Lasts Longer】High-speed steel core with titanium nitride coating provides extreme heat and abrasion resistance. These step drill bits for metal maintain sharpness through stainless steel, aluminum, iron, and other tough materials

【Spiral Flute & 118° Tip - Precision Meets Performance】Dual-spiral flute design ejects chips rapidly for cooler operation and cleaner holes. Combined with the 118° split point tip that self-centers and prevents walking, you get professional results even on curved surfaces

【1/4" Hex Shank - Instant Compatibility & Maximum Grip】Ready for any drill or impact driver with its standard 1/4" hex shank. The step bit for impact driver ensures secure grip without slippage, while quick-change capability saves time on every project

【Complete in Aluminum Case - Organized & Portable】All 5 HSS titanium step drill bits come in a durable aluminum storage case (6"×4.45"×1.7"). Keep your workshop tidy and carry your step up drill bit for metal anywhere - ideal for contractors and DIY lovers alike

OSTTE professional step drill bits set condenses 50 of the most essential hole sizes (from 3/16" to 1-3/8", including the common 3/4 step drill bit size) into just 5 precision-engineered titanium step drill bits. This efficient step bit kit is your ultimate solution for working with a wide variety of materials. Whether tackling tough metal step drill bit applications like step drill bits for iron, stainless steel, and aluminum, or working with softer materials like step drill bit for plastic and wood, this versatile cone drill bit set handles it all. The unique uni bit design (also known as unibit step drill bit or stepper bit) allows for rapid, consecutive drilling of multiple sizes with a single tool, dramatically improving efficiency. It's the ideal choice for electricians, plumbers, metalworkers, and DIY enthusiasts. Each step drill bit is crafted from a high-quality High-Speed Steel (HSS) core and coated with a durable titanium nitride layer. This titanium coating not only increases the hardness of the step bits but also provides exceptional resistance to friction heat, ensuring the drill cone drill bit maintains its sharpness when piercing hard metals for a significantly longer service life. The innovative dual-spiral flute (Spiral Flute) design is a core advantage of this drill step bit set. It rapidly ejects drilling debris, keeping the cone drill bit for metal process cool and smooth, preventing bit binding, and producing cleaner holes. Combined with the 118° self-centering tip, this step down bit accurately locks onto your starting point, completely preventing "walking" on curved or smooth surfaces for a perfect start every time. The standard 1/4-inch hex shank provides instant compatibility for your uni bit drill bit with any drill or impact driver, ensuring maximum torque transfer without slippage.