These new windshield knobs are CNC machined from premium quality 6061 billet aluminum with a clear anodized finish and feature Scott Drake's patented rubber tire tread grip for a rugged appearance. Each windshield knob is designed with OEM quality in mind, meaning installation is easy without any modifications for a direct-fit replacement. Simply twist the old knobs off and then screw the new billet knobs on; it's that easy! These American made, billet windshield knobs are the perfect addition to classic Bronco