Hard brush for the 18V Twin Brush

The Twin Brush is compatible with 3 different brushes; soft (black), medium (blue) and hard (red)

The soft brush you use for surfaces like: caravans & boats
The medium brush for surfaces like: caravans, houses, boats, swimming pools, tiles & (wooden) planks
The hard brush you use for surfaces like: caravans, bathrooms, swimming pools, tiles & (wooden) planks