Twist drill bit IRWIN 10502538 5 pcs 1 cm diameter

The IRWIN 10502538 twist drill bit set contains five HSS cobalt bits with a 10 mm (1 cm) diameter engineered for drilling metal and other demanding materials. Each bit is manufactured to DIN 338 standards and incorporates 5% cobalt for improved heat and abrasion resistance. The 135° split point design helps start holes quickly and reduces walking, while the heavy-duty web construction increases strength and durability during high-torque work.

Advantages

These HSS cobalt drill bits offer enhanced performance when cutting hard or heat-treated metals thanks to the 5% cobalt content. The 135° split point reduces the need for center punching and improves accuracy at the start of the cut. Heavy-duty web construction and robust material composition increase service life under continuous or heavy workloads, and compliance with DIN 338 ensures consistent geometry and tolerances.

Suitable for

• Drilling through hardened and alloy steels
• Workshops and industrial maintenance tasks
• Metal fabrication and engineering applications
• Professional or advanced DIY projects requiring durable metal drilling tools

Key specifications

• Bit type: Twist drill (spiral fluted)
• Material: High-speed steel with 5% cobalt (HSS-Co)
• Diameter: 10 mm (1 cm)
• Set quantity: 5 pieces
• Point geometry: 135° split point
• Construction: Heavy-duty web for increased strength
• Manufacturing standard: DIN 338 compliant geometry
• Primary application: Tough metal and heat-treated alloy drilling

How to use

Select an appropriate drill speed and feed for the material being drilled; lower speeds and steady pressure are recommended for hardened steels. Secure the workpiece firmly in a vise or fixture to prevent movement. Use cutting fluid or coolant when drilling metals to reduce heat buildup and prolong bit life. Begin drilling with controlled pressure so the 135° split point can engage and center the bit, then maintain consistent feed until the hole is complete. Clear chips frequently to avoid clogging and overheating.

Usage recommendations

For best results when drilling hard or heat-treated metals, use appropriate cutting fluid, moderate spindle speeds, and light to moderate feed rates. Re-sharpening should be done by a qualified service if wear is significant; replace bits if chipping or excessive wear compromises hole quality or safety.