10Pcs Titanium Coated HSS Twist Drill Bits, 1/4" Hex Shank, 135° Point & Spiral Flute, for Drilling Stainless Steel Metal Holes (4.2mm)

SpecificationItem Type: Twist Drill BitsQuantity: 10 Pieces per setMaterial: HSS 6542 (M2)Surface Finish: Titanium Coated (TiN)Diameter Range: 1.5 mm – 13 mmPoint Angle: 135°Flute Type: Spiral FluteShank Type: 1/4" Hex ShankCompatible Tools: Electric drills, Cordless drills, or Drill pressesApplication: Suitable for drilling carbon steel, alloy steel, stainless steel, cast iron, aluminum, copper, brass, etc. (Not suitable for masonry, concrete.)Package list10 x Twist Drill BitsNoteRPM decreases as diameter increases. Recommended RPM: 1–2 mm: 3000–1800 RPM, 2–3 mm: 1800–1400 RPM, 3–4 mm: 1400–1000 RPM, 4–5 mm: 1000–800 RPM, 5–6 mm: 800–700 RPM, 6–7 mm: 700–600 RPM, 7–8 mm: 600–500 RPM, 8–9 mm: 500–400 RPM, 9–10 mm: 400–350 RPM, 10–11 mm: 350–300 RPM, 11–12 mm: 300–280 RPM, 12–13 mm: 280–250 RPM

• Versatile Titanium Toughness for Every Material – Titanium-coated HSS 6542 bits slice effortlessly through carbon steel, stainless steel, iron, aluminum, and more. Durable coating reduces friction and heat, ensuring long-lasting sharpness for all your DIY metal and wood projects.
• Precision 135° Point & Hex Shank for Clean, Safe Drilling – The self-centering 135° split point starts drilling instantly, preventing walking and giving you clean, accurate holes. The 1/4" hex shank ensures a secure, slip-free grip in any drill chuck or quick-change holder.
• Complete 10-Piece Set for Any Job (1.5–13 mm) – From fine 1.5 mm holes to robust 13 mm bores, this comprehensive set covers all common sizes. Perfect for professionals and hobbyists tackling everything from electronics repair to furniture assembly.
• Spiral Flute Design for Faster Chip Removal – The high-performance spiral flutes efficiently eject chips, keeping your workpiece clean and preventing bit clogging. This means smoother drilling, less heat buildup, and a consistently professional finish.
• User-Friendly Speed Guide for Perfect Results Every Time – Stop guessing at drill speeds. Our clear RPM chart (e.g., 3000 RPM for 1 mm, 250 RPM for 13 mm) takes the guesswork out, helping you match speed to bit size for cleaner holes, longer bit life, and safer operation.