Feature:Matte Texture FinishExclusive surface treatment, Eliminate the mill marks and burrs of CNC machining.The bracket is sand-blasted and anodized for an elevated, frosted texture.Durable construction18-8 stainless steel j bolt & hardware kits,anti-rust, sturdy and available for long service life.Unique lock washer prevents the hold down bracket from loosening due to vibration of the vehicle.The wing nuts could replace hex nuts...