Hole Saw Arbor with Pilot Drill Koelner/Rawlplug MN-61-454 for 32–168 mm Core Bits

The Hole Saw Arbor with Pilot Drill Koelner/Rawlplug MN-61-454 is an arbor designed to mount core bits with diameters from 32 mm to 168 mm. It includes an integrated pilot drill that provides reliable centering and helps maintain stable drilling when used with standard electric drills. The arbor is intended for cutting circular openings where compatible core bits are fitted, and it is suitable for tasks in plumbing, HVAC, electrical installation and general construction.

Advantages

The arbor's adjustable compatibility with a wide range of core bit diameters reduces the need for multiple specialized arbors. An included pilot drill improves hole precision and reduces bit walking at the start of drilling. The arbor is constructed to provide a secure connection between the drill and the core bit, offering stable operation and consistent hole geometry when used with appropriate core bits and drill settings.

Suitable for

• Installing pipes and fixtures in plumbing
• Cutting ventilation and duct openings in HVAC systems
• Creating cable and conduit passages during electrical installation
• Forming circular penetrations in light construction and maintenance work

Key specifications

• Compatible core bit diameter range: 32–168 mm
• Includes pilot drill for centering and initial guidance
• Designed for use with electric drills (chuck-mounted)
• Suitable for use with compatible bi-metal or carbide-tipped core bits depending on material

How to use

Secure the pilot drill into the drill chuck and attach the arbor to the selected core bit following the manufacturer's fitting method. Mark the drilling position on the workpiece and align the pilot drill with the mark. Start drilling at low speed to allow the pilot drill to create a guide hole, then increase speed as appropriate for the drill and the material. Apply steady, even pressure without forcing the tool; allow the core bit and arbor to do the cutting. After completing the cut, stop the drill before withdrawing the core bit and arbor to avoid damaging the workpiece or the cutting teeth.

Usage recommendations

Use appropriate personal protective equipment and select core bit types and drill speeds suitable for the material being cut. Check that the arbor and core bit are securely fastened before each use and periodically inspect the pilot drill for wear. For thicker or harder materials, use a lubricant or coolant if compatible with the core bit to extend tool life and improve cutting performance.