QuickBOLT Butyl Bottom Deck Mount Kit is backed with Peel-and-Place Butyl, ensuring a secure and watertight seal. Each kit includes four 5/16 x 2 1/2" hex lag screws made from 302/304 stainless steel and assembled with stainless steel sealing washers for enhanced durability and corrosion resistance. The mount features a mill silver finish for a sleek appearance and is now Miami-Dade County approved, meeting stringent quality and performance standards.