Bosch HSS Extra Hard 35-Piece Metal Drill Bit Set in Plastic Cassette (2607017726)

For the metalworker or serious DIYer, the Bosch 35-piece HSS Extra Hard drill bit set delivers a comprehensive range of twist drills in a rugged plastic cassette. From 1 mm pilot holes to 10 mm clearance holes, these bits handle steel, non-ferrous metals, cast iron and hard plastics with a self-centering split point that prevents walking and reduces thrust pressure. The set is ideal for workshop use, on-site installation, or maintenance tasks where a full range of diameters is needed at hand.

Key specifications

• Set contains 35 twist drill bits, DIN 338, right-hand cut
• Diameters from 1.0 mm to 10.0 mm in 0.5 mm increments (plus 1.2 mm, 1.6 mm, 1.8 mm, 3.3 mm, 4.2 mm, 7.2 mm)
• High-speed steel ground (HSS-G) with bright finish for durability
• 135° split point for fast, accurate centering without a centre punch
• Extra Hard series for extended life in tough materials
• Supplied in a clear plastic cassette with size markings for organisation

Why choose it

The Bosch Extra Hard HSS-G bits are precision ground from high-speed steel, giving them a sharper cutting edge and longer service life than rolled bits. The 135° split point starts drilling immediately on contact, reducing wandering and the need for pilot holes in many applications. The cassette keeps each bit securely in its labelled slot, so you can quickly find the right size and see when one is missing.

Ideal use cases

• Drilling steel, stainless steel, cast iron and non-ferrous metals
• Creating precise holes in hard plastics and composite materials
• General workshop, automotive, and metal fabrication tasks
• Maintenance and repair jobs requiring a wide range of diameters

Good to know

These bits are designed for use with standard drill chucks and are suitable for both corded and cordless drills. For best results, use cutting fluid when drilling hard metals and reduce speed for larger diameters. The set's compact cassette fits easily in a tool drawer or carry case, making it a practical addition to any metalworking toolkit.