Drill bit DRAUMET BI-metal 22 mm Kroņurbis

DRAUMET BI-metal 22 mm Kroņurbis is a bi-metal crown drill bit engineered to cut precise 22 mm diameter circular holes. Designed for tasks where a crown bit is needed, the tool combines a hardened cutting edge with a flexible steel body to balance cutting performance and resistance to breakage. The construction extends working life compared with standard high-speed steel bits and suits a range of common building and maintenance materials.

Advantages

The bi-metal construction provides a durable cutting edge with improved heat resistance and reduced wear during repetitive use. The crown geometry allows fast and clean hole cutting with reduced material binding. A reinforced body helps resist bending and increases service life, while the cutting teeth stay sharper longer than simple HSS designs. The bit is compatible with standard drill chucks used in handheld and portable drilling tools.

Suitable for

• Making 22 mm diameter holes in wood and laminated panels
• Drilling through drywall and gypsum board for fittings and inserts
• Cutting holes in soft plastics and composite materials
• Installation tasks such as door hardware, cable routing and plumbing fixtures
• Carpentry and joinery where repeatable, clean circular holes are required

Key specifications

• Type: Bi-metal crown (hole saw) drill bit
• Nominal diameter: 22 mm
• Material: High-speed steel cutting edge welded to spring steel body (bi-metal construction)
• Intended use: Cutting circular holes in wood, drywall, plastics and similar materials
• Compatibility: Fits standard drill chucks and portable drills

How to use

Secure the drill bit in a compatible drill chuck and tighten firmly. Mark the hole center on the workpiece and, if necessary, clamp the workpiece to prevent movement. Start drilling at low speed to establish the cut, then increase to medium speed while applying steady, even pressure. Allow the bit to cut without forcing; withdraw periodically to clear debris and reduce heat buildup. After completing the hole, remove any burrs or splinters with a file or sandpaper.

Usage recommendations

Use appropriate personal protective equipment such as safety glasses and hearing protection. For prolonged drilling or harder materials, use intermittent drilling to avoid overheating and consider light lubrication where suitable for the material. Replace the bit if cutting performance degrades or teeth become visibly worn.