The stainless steel cover and its ring of protective bristles shield you from flying debris and splashback as you work. QUICK & THOROUGH: Our20" surface cleaner head for powered washers has two rotary nozzles and 4 caster wheels perfect for quick and thorough scouring of driveways, sidewalks, patios, and decks as well as large vertical surfaces like walls, garage doors, fencing, and more.