Drill Bit for Mineral Wool RAWLPLUG R-KFS-90/20 (90 mm / 20 mm) - 1 pc

RAWLPLUG R-KFS-90/20 is a drill bit specifically developed for creating clean, accurate holes in mineral wool insulation. With a 90 mm cutting diameter and a 20 mm shank/neck dimension, this single-piece tool is made to work with compatible drilling equipment used by installers and tradespeople for fitting anchors and fixings into thermal and acoustic insulation layers.

Advantages

The design concentrates on fast penetration and minimal disturbance of the fibre structure to produce neat circular openings suitable for anchor sleeves and insulation fixings. The 90 mm cutting diameter allows for a consistent hole size while the 20 mm neck provides stable connection to the drill, reducing wobble during operation. Supplied as one unit, it is ready for immediate use and simplifies on-site logistics.

Suitable for

• Drilling circular holes in mineral wool or similar fibrous insulation boards.
• Preparing openings for insulation anchors, sleeves and large-diameter fixings.
• Use by installers, facade fitters and construction trades during insulation installation or renovation.
• Creating pass-throughs for services where neat, precise apertures are required in insulation layers.

When it may not be suitable

This drill bit is intended specifically for use in mineral wool and similar insulating materials; it is not designed for masonry, concrete, metal or dense wood. Using it on harder substrates can damage the tool, reduce cutting efficiency and produce poor results. Ensure the drill and chuck capacity match the 20 mm neck before attempting to use the bit.

Key specifications

• Cutting diameter: 90 mm
• Shank/neck dimension: 20 mm
• Material suitability: mineral wool and fibrous insulation
• Quantity: 1 piece

How to use

Fit the R-KFS-90/20 into a compatible drill or drive system that accepts a 20 mm shank and ensure the chuck or adapter is tightened securely. Position the bit perpendicular to the insulation surface and apply steady, even pressure while drilling to maintain a clean cut and avoid tearing fibres. Operate at an appropriate rotational speed recommended for insulation materials; withdraw the bit periodically if necessary to clear cut material. After drilling, inspect the hole for clean edges and remove loose fibres before installing anchors or fixings.

What to consider before purchase

• Confirm the bit’s 90 mm diameter matches the required opening size for your anchors or sleeves.
• Verify your drill or adapter supports a 20 mm shank for secure mounting.
• Check that your application involves mineral wool or equivalent fibrous insulation rather than masonry or metal.

Usage recommendations

For best results, use steady low-to-moderate drill speed and avoid side loads. Store the bit in a dry place to prevent corrosion and inspect before use for any signs of wear or damage that could affect cut quality.