The Vevor deck post base set includes 10 powder-coated steel bases designed to fit 4 x 4" posts with a 3.38 x 3.38" inner size. Built from 1.5 mm thick steel, these bases help provide stable support for deck posts, porch railings, stair handrails, and mailbox posts. The powder-coated finish helps resist corrosion for long-term outdoor use. Installation is straightforward, and the required screws and expansion pipes are included. This set is well suited for mounting on wood decks or concrete surfaces.