Circle cutter drill bit KWB 178100 diameter 9 cm

The KWB 178100 circle cutter drill bit has a 9 mm shank and an adjustable cutting arm for circles from 20 to 90 mm. The cutter is tipped with tungsten carbide for durability and is intended for cutting clean circular openings in materials such as tiles, bricks, plaster and plastics. Its construction supports repeated use in general renovation and installation tasks where precise round holes are required.

Advantages

The tungsten carbide tip provides increased wear resistance for longer tool life compared with standard steel cutters. Continuous adjustment of the cutting arm allows quick selection of diameters between 20 and 90 mm without changing tools. A 9 mm shank fits common drill chucks and enables stable mounting during operation.

Suitable for

• Cutting circular openings in tiles and ceramic materials
• Drilling round holes in brick and plaster
• Making precise circular cuts in plastic sheets and panels
• General renovation tasks that require round holes for pipes, conduits or fittings

Key specifications

• Adjustable cutting diameter: 20–90 mm
• Cutting tip material: tungsten carbide
• Shank diameter: 9 mm
• Suitable for: tiles, bricks, plaster, plastics

How to use

Secure the 9 mm shank in a compatible drill chuck and set the cutting arm to the required diameter between 20 and 90 mm. Position the cutter perpendicular to the work surface and start the drill at a moderate speed, applying steady pressure. For brittle materials such as tile or plaster, begin at low speed and increase gradually; use water for cooling when cutting ceramic or stone-like materials to reduce heat and extend tip life. After cutting, clear debris and inspect the edge for any necessary finishing.

Usage recommendations

Use appropriate personal protective equipment (safety glasses, gloves and dust mask), secure workpieces before cutting and avoid excessive side load on the cutting arm. For best results on ceramic tiles or stone-like surfaces, use water cooling and steady, moderate drilling speed.