Tie Down Engineering 8 Trailer Bolster Bracket with Swivel Tie Down Engineering Trailer Bolster Brackets Pair designed to support trailer bolster or bunks. Brackets are slotted for vertical adjustment and feature non-slip dimples to avoid movement and increase load capacity. Swivel brackets and hardware included. 8 Brackets Sold as Pair Hot dipped galvanized finish provides corrosion protection Zinc plated hardware included California Residents WARNING Cancer and Reproductive Harm - P65Warnings.