Drill bit set Irwin 10502266 — 10 pieces, 3.5 mm diameter

Irwin 10502266 is a 10-piece drill bit set with 3.5 mm diameter bits designed for general-purpose drilling. Each bit is precision ground and manufactured to DIN 338 standards, featuring a universal 118° point and ground flute geometry for accurate centring, rapid chip evacuation and a clean hole finish. The bits come with a cylindrical shank and are supplied in a Quadro Pack for convenient storage and transport.

Advantages

The set offers consistent performance across all ten 3.5 mm bits thanks to precision ground cutting edges and ground flute design that reduce vibration and improve accuracy. The universal 118° point shape minimises walking at start-up and is suitable for a range of common materials. Manufactured to DIN 338 standards, these drill bits provide predictable quality and dimensional conformity for assembly, maintenance and light construction tasks.

Suitable for

• Drilling 3.5 mm clearance or pilot holes in plastic components
• Making precise small holes in soft metals such as aluminium
• Woodworking tasks requiring 3.5 mm holes for dowels, screws or fittings
• General workshop and maintenance drilling where a uniform bit size is needed

Key specifications

• Set composition: 10 pieces of identical 3.5 mm diameter drill bits
• Drill diameter: 3.5 mm
• Overall length: 70 mm
• Point angle: 118° universal point
• Shank type: Cylindrical shank
• Manufacturing standard: DIN 338 ground quality
• Flute type: Ground flute for fast chip removal
• Packaging: Quadro Pack for storage and transport
• Suitable materials: Plastic, soft metal, wood

How to use

Select a 3.5 mm drill bit from the Quadro Pack and secure it into the drill chuck, ensuring the cylindrical shank sits firmly. Use appropriate drill speed and feed for the material—lower speeds for soft metals and higher speeds for plastics and wood—to reduce heat and improve chip evacuation. Apply steady pressure and allow the drill bit to cut without forcing; withdraw periodically in deeper holes to clear chips. For best results, clamp workpieces securely and use cutting fluid when drilling metals to extend bit life.

Usage recommendations

For prolonged bit life and consistent hole quality, maintain correct spindle speed for the material being drilled, keep the flutes clear of chips, and store bits in their Quadro Pack to protect cutting edges. When drilling metals, use suitable lubricants and moderate feed to avoid overheating. Inspect bits for wear and replace when cutting edges become dull or chipped.