VALYRIANTOOL 3-Piece Cobalt Drill Bits - 5/8-Inch HSSCO M35, 1/2-Inch Reduced Shank, 6-Inch OAL, 135° Split Point

Overview

This VALYRIANTOOL cobalt drill bit set brings professional-grade metalworking capability to your toolbox. Crafted with M35 cobalt-enhanced HSS, these bits strike a thoughtful balance between hardness and toughness, helping them hold up under common metalworking tasks and alloys without dulling quickly. The black and gold polished coating adds lubricity and helps keep coolant near the cutting edge, supporting smoother cuts and steadier performance across a range of metals.

Key advantages

• M35 HSSCO high-speed steel delivers a strong blend of hardness and toughness for wear resistance in everyday metal drilling.
• Black and gold polished treatment reduces friction and helps coolant stay close to the cutting edge for cooler, cleaner cuts.
• 135° split-point design promotes accurate centering at drill start and fast penetration, while the round shank supports broad toolholding compatibility.
• Right-hand spiral flutes actively evacuate chips to minimize clogging and maintain a consistent cutting path.
• Versatile for metals such as cast iron, zinc alloy, copper, stainless steel, and other common materials.

Materials, compatibility, and real-world use

The set is built for versatility in metalworking projects. The 1/2-inch reduced shank expands chuck compatibility, letting you pair these bits with a wider range of toolholding systems. The 6-inch overall length provides reach for panels, brackets, and intermediate components, making it suitable for home workshops and professional shops alike. Whether you’re working on brackets, housings, or light structural parts, these bits offer a reliable option for metal drilling tasks without making distant promises about results.

What you get

• Three pieces, each with a nominal diameter of 5/8 inch.
• 1/2 inch reduced shank to fit common chucks and tooling setups.
• 6 inches of overall length for extended reach in confined spaces.

Usage tips

• Secure the workpiece and mark the center for precise starts.
• Apply light lubrication or cutting fluid to reduce heat buildup.
• Start drilling at a moderate speed and maintain a steady feed rate.
• Periodically pause to clear chips and prevent chip buildup.
• Choose the correct speed according to material density and bit diameter.

In short, this set offers a practical balance of durability, versatility, and compatibility for metal drilling tasks in a variety of settings.