Bio-Kleen Polishing Ball is the fastest and most efficient way how to polish and buff metal, clearcoat, and fiberglass surfaces. It's 4" diameter and soft, durable fiber makeup makes it easy to fit into tight, hard to reach areas and performs excellent on both smooth and textured surfaces. The polishing ball connects to any common drill. Note: polishing ball may not need to be washed inbetween applications if polishing the same surface type using the same polish. Metal polishing applications include: snowmobile tunnels, billet, diamond plate, running boards, motorcycle pipes, marine pipes, aluminum, stainless steel, brass, copper, bronze, nickel, and more. Other polishing applications include: painted surfaces, fiberglass, clearcoat, plastics, rims, snowmobiles, motorcycles, automobiles, boats, and RVs.