Kornely™ Premium Drill Brush - Stiff, Red, 13 cm. Professional Power Scrubber. Doesn't Scratch Surfaces. Suitable for Garage, Brick, Outdoor Tiles, Stone, Fireplace, Rust Removal, Car Rims Cleaning

Bought to help remove old render from fireplace, after opening up for a log burner.This reduced the time scrubbing massively, we found lower speed for this job more effective. Do watch out for drill overheating. The bristles on the edges did wear slightly & bend inward but was a tough job.

Strong, reliable and very effective.

Because the bristles are stiff they do not push into the surface you are scrubbing like the medium bristles do. I was trying to remove black tar & this got less off

Did a great job at cleaning the grout in between floor tiles.