SEDIANAS Cobalt Drill Bit Set – 29Pcs M35 HSS Twist Bits for Hardened Metals, Stainless Steel, Cast Iron & Wood, 1/16-1/2 inch

Overview

Elevate your drilling projects with the SEDIANAS Cobalt Drill Bit Set, a rugged collection designed for precision and longevity. Built around M35 cobalt high speed steel, this 29-piece kit blends heat resistance with hardness, helping you tackle demanding materials with confidence. The bits are ready to perform whether you’re working on metal, wood, or tough plastics, offering a dependable starting point for clean, accurate holes.

Why choose this set

Key design choices prioritize performance in real-world tasks. The 135-degree split point features a self-centering tip that helps prevent walking at startup, so you can begin holes more reliably. The twist bits are fully ground, promoting faster chip clearance and reduced heat buildup, which contributes to cooler drilling even under challenging workloads.

What you get

The kit spans 29 sizes from 1/16 inch up to 1/2 inch, giving you a versatile range for pilot holes, through-holes, and larger bore requirements. A metal index storage box is included to keep everything organized and easy to locate, saving time on busy workbenches.

• M35 cobalt composition (approx. 5% cobalt) delivers enhanced heat resistance and hardness for tough materials.
• Designed for hard metals such as stainless steel and cast iron, as well as high-temperature alloys and titanium-grade materials.
• Suitable for hard plastics and wood, making it a versatile choice for mixed-material projects.

Real-world use and tips

Picture creating precise holes in a stainless steel frame, or starting a clean pilot hole in dense hardwood for hardware installation. The 29-piece range supports quick size changes on the fly, while the storage box helps you stay organized on site.

• Self-centering 135-degree tip reduces drift for more accurate starts.
• Efficient chip clearance and cooler operation may extend bit life in demanding tasks.
• Compact, labeled index box makes it easy to grab the right size fast.

Usage notes

To maximize performance, use appropriate speeds for the material, maintain sharp edges, and withdraw periodically to clear chips. Pair the bits with pilot holes when working with very hard materials to preserve alignment and hole quality.