Feature:Exclusive surface treatment, Eliminate the mill marks and burrs of CNC machining.The bracket is sand-blasted and anodized for an elevated, frosted texture.18-8 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 for freehand installation...