30" Black Angled Powder Coated Mud Flap Hanger 2 1/2" Bolt Semi Truck TaperedMud flap hangers are used on semi trucks and trailers to keep mud flaps hanging over the tires. This allows you to keep the trucks frame clean and prevents the tires and undercarriage from being hit by or covered in salt and debris from the road. Mud flap hangers come in various styles such as straight, tapered, and angled. Angled mud flap hangers offered by Pit Stop come in 45 degree angle sets. Some mud flap hangers are made of stainless steel,