These quick twist-lock Boat-Windshield Holder Clips from T-H Marine make installing and removing a windshield quick and easy. The base mounts with 2 screws to the boat and the quick-twist fastener passes through the windshield. Prevents broken windshields in shipping and installation or when removing windshield for cleaning. Made in USA. 5.5L x 4.1H x 1D. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.