These stainless steel skid plates are designed to fit our KB4 bags. The plates wrap around the radius of the bag on the end and the side providing excellent protection from accidental dragging. The KB4 bag bottom is 21.5" long. The skid plates is 21" long. These plates are made from stainless steel so they are not only strong but also corrosion resistant. They are available polished or in a black textured powder coat. They are installed with two-sided trim tape.