Compare our Quality Products to the Cheap Imports and Domestics! Rugged and durable OEM-grade Spring-Loaded Mud Flap Hangers are manufactured from heavy-gauge steel and 304 Stainless. Featuring durable powder-coat, beautiful SuperPremium® Chrome. Heavy-Duty internal springs offer surprising resilience and durability even under the worst circumstances. Industry standard 1.125″ Bolt Patterns.