Diablo 3 x 21 in 120 grit sanding belts include breakthrough innovations that improve performance, extend sanding life and increase productivity. Featuring a premium zirconium blend, these belts remove material faster than other sanding belts and offer an extra long sanding life. Clog-Shield™, Diablo own blend of grinding agents, reduces loading thus maximizing productivity. The great grain bonding system, endura-bond, provides Diablo belts with longer life and extreme durability.