Drill bit set Irwin 10502321 — 5 pcs, 9 mm diameter

Irwin 10502321 is a set of five 9 mm drill bits manufactured to DIN 338 standards. Each bit features precision ground cutting edges, a ground flute for efficient chip removal and a universal 118° point shape that supports drilling in a range of common materials. The bits have a cylindrical shank and come in a Quadro Pack for storage and transport. Their 125 mm length and consistent 9 mm diameter make the set suitable for tasks requiring repeatable hole sizes with standard drill chucks.

Advantages

The drill bits are precision ground for fast drilling and improved surface finish, while the ground flute enhances accuracy and chip evacuation. Compliance with DIN 338 ensures dimensional reliability and durability for general-purpose use. The universal 118° point reduces the need for pre‑centering on many materials, and the cylindrical shank is compatible with most standard drill chucks. The five-piece pack supplies multiple replacements for repeated or multi-point work.

Suitable for

• Drilling 9 mm holes in wood
• Drilling in soft metals such as aluminium and brass
• Drilling through plastics and composite panels
• General workshop and construction drilling tasks requiring consistent hole size

Key specifications

• Type: Twist drill bits, set of 5
• Diameter: 9 mm
• Overall length: 125 mm
• Point angle: 118° (universal)
• Shank: Cylindrical
• Flute: Ground flute for improved chip removal
• Cutting edges: Precision ground
• Standards: Manufactured to DIN 338
• Packaging: Quadro Pack

How to use

Select an appropriate drill and secure the cylindrical shank in the chuck, tightening it according to the drill manufacturer’s instructions. Mark the centre of the hole and, if necessary, use a centre punch to prevent walking on smooth surfaces. Start drilling at a moderate speed for soft metals and plastics, and increase speed for wood as appropriate. Apply steady axial pressure, withdraw periodically to clear chips when drilling deep holes, and allow the bit to cool if drilling metals to avoid overheating. Replace bits from the pack when wear or shortening affects hole quality.

Usage recommendations

Use suitable cutting fluid or lubrication when drilling harder or heat‑sensitive metals, and wear appropriate eye and hand protection. For best results in thin or delicate materials, consider backing the workpiece and starting with a lower speed to prevent tear-out. Store the bits in their Quadro Pack to protect cutting edges and ensure consistent performance.