65mm Drill Bits

When you need to bore very large 65mm holes through tough structural materials, our range of professional core drill bits delivers the uncompromising performance required. Cutting a hole of this diameter through solid masonry requires significant power and specialist accessories. 65mm is a standard size frequently used by electricians for sinking circular dry lining boxes (pattress boxes) into walls to house electrical switches and sockets. These bits are also essential for routing various pipes and large cables cleanly and efficiently.

We supply a focused selection of 65mm dry diamond core drill bits, specifically engineered for cutting through hard masonry, brick, blockwork, and ceramic tiles without causing excessive spalling or damage to the surrounding material. Unlike standard bits, core drills cut only the outer circumference of the hole, removing a solid plug, which makes the process much faster and reduces strain on your power tool. Choose from premium options featuring slotted barrels for superior dust extraction and heat reduction. Ensure professional, trade-quality results with stock from leading brands like Bosch and Mexco.

Frequently Asked Questions | FAQs

What is a 65mm core drill bit used for?

A 65mm core drill bit is most commonly used by electricians to cut the perfect-sized hole in masonry walls (brick, block, etc.) for installing standard circular dry lining back boxes (pattress boxes). These boxes house electrical switches and plug sockets. 65mm is also used for running various types of pipework through walls.

Do I need a special drill for a 65mm core bit?

Yes. You should use a dedicated diamond core drill or a heavy-duty rotary hammer drill (with the hammer action switched off). Drilling a 65mm hole requires a significant amount of torque, and using a standard combi drill is very likely to burn out the motor. Furthermore, a heavy-duty drill should feature a safety clutch; if the large core bit jams in the wall, the clutch will disengage the drive, preventing the drill from spinning violently out of your hands and causing injury.

Should I use hammer action with a diamond core bit?

No, you must never use the hammer action setting when using a diamond core drill bit. The hammering action will shatter the diamond segments on the cutting edge, destroying the bit. Diamond core bits are designed to cut through friction and abrasion using rotary action only