Heavy Duty 3 space single wave bike rack constructed of galvanized 2 3/8" OD pipe. This quick ship bike rack can be mounted in-ground or surface mounted for resistance to vandalism. Surface Mounting requires the bike rack to be bolted onto a concrete surface. In-ground mounting requires the posts to be placed into a hole with concrete poured. Galvanized steel bike racks are the toughest bicycle racks for commercial use.