Diamond hollow annular drill bit, Wolfcraft 1 (7958000) – diamond cutting edge for metal and masonry

Diamond hollow annular drill bit Wolfcraft 1 (7958000) is a core drill crown with a brazed diamond cutting edge, designed to cut precise through-holes in hard materials. The tool is intended for use with compatible drill rigs and holders and is suitable for masonry, concrete, tile and selected metal surfaces when appropriate cooling and feed rates are used. The construction features diamond segments brazed to the rim to provide long life and steady cutting performance while minimising vibration during operation.

Advantages

The diamond cutting edge provides quick, fine cuts and maintains sharpness for an extremely long service life. Vibration-free operation improves hole quality and reduces user fatigue when used with a stable drill rig. The tool is built with brazed diamond segments for durability and consistent performance. The product is supplied in a storage box on card and includes version details such as two discharge holes and an exterior conveyor screw to aid chip and cooling fluid evacuation.

Suitable for

• Creating flush and accurate through-holes in brick and masonry for electrical and plumbing installations
• Drilling clean holes in concrete and tile where minimal chipping is required
• Cutting holes in some metal applications when used with correct drilling equipment and cooling
• Installation tasks requiring vibration-reduced cutting such as socket, distribution box and cavity box mounting

Key specifications

• Cutting edge: brazed diamond segments
• Intended materials: masonry, concrete, tile, selected metals
• Tool type: hollow annular (core) drill bit / drill crown
• Design features: two discharge holes and exterior conveyor screw for chip/cooling evacuation
• Packaging: storage box on card; supplied as one hollow annular bit

How to use

Mount the hollow annular bit in a compatible drill rig or arbor according to the drill manufacturer's instructions. Secure the workpiece and align the drill to the required hole position. Use steady feed pressure and appropriate rotational speed for the material; apply a coolant or water feed when drilling masonry, concrete, tile or metal to reduce heat and extend tool life. Start drilling at low speed to establish the pilot and then increase speed as recommended by the drill rig. Withdraw periodically to clear chips if necessary, and avoid excessive side load to prevent damage to the diamond segments.

Usage recommendations

Use appropriate personal protective equipment including eye protection, hearing protection and dust control. For concrete and masonry, use continuous water supply or intermittent cooling to reduce dust and keep the diamond segments cool. For metal drilling, ensure suitable cutting fluid and lower speeds to prevent overheating. Match drill rig capacity and arbor type to the hollow annular bit to ensure stable, vibration-free operation and optimal hole quality.