Washers are used in combination with nuts and bolts. The pressure distribution of the nut and bolt on the material becomes much more favorable by using a washer. In washers, there are two types: Flat washer (DIN125A) and faceted washer (DIN125B). With a closure, the diameter of the ring is always (approximately) twice the hole size of the ring. Closures are available in steel (galvanized), brass, nylon and in stainless steel A2 and A4.