Shurhold's special application series of brushes is designed for more specialized work beyond just regular washing. This series includes attachments compatible with Shurhold handles. These are based out of a solid wood block with a rubber wrap-around bumper to prevent marking any surface. SHUR-LOK attachments that quickly lock into any Shurhold handle include: Soft Round brush- (Item# 50) 5 inch round brush with yellow polystyrene bristles. Safe on gelcoat, clear coat, fiberglass and and paint, and its small size is perfect for getting into small areas.