amoolo 1/4 inch Cobalt Drill Bit Set (10 Pcs) – M35 HSS for Hard Metals

Meet the amoolo 1/4 inch cobalt drill bit set, a compact kit designed to tackle harder materials with steadier precision. Each bit is built with M35 high speed steel containing 5% cobalt, offering improved wear resistance and longer life compared with standard HSS bits. The result is a cleaner hole and less downtime spent changing bits.

The kit includes 10 bits, all sized 1/4 inch in diameter and 2-3/4 inches in flute length (69.85 mm). This combination is sized for common metalworking tasks and fits a wide range of power drills currently on the market, making it a practical addition to home shops and professional garages alike.

Why these bits perform well

• Fully ground spiral design for fast chip evacuation and reduced heat buildup.
• 135 degree split point with straight shank prevents walking and speeds drilling; no center punch required.
• 5 cobalt content enhances wear resistance for hard metals such as stainless steel, steel, and cast iron; also handles plastic, aluminum, and wood.

In practice, you will notice smoother starts when drilling into tough alloys and a more consistent hole with less guide work. The 2-3/4 inch flute length supports a good balance between rigidity and reach, helping you tackle both shallow and deeper holes in metal and some non metal tasks.

Usage tips

• Keep speed and pressure under control; overheating can reduce performance and wear life.
• Use appropriate lubrication or cooling when drilling harder metals to maximize effectiveness.

Every purchase is backed by a 90 day warranty. If you are not fully satisfied, you can request a refund or a replacement, making this a low risk addition to your toolkit. While results vary with technique and material, this set offers a strong balance of durability, versatility, and practical performance that aligns with common metalworking projects.