Perf-O Grip® bolt seats provide a secure anchor of the grating to structural supports. The standard bolt seat features oblong holes specifically designed to ensure a vertical anchor (with a 3/8” bolt) even if the hole is off concentrically by as much as 1/4”. Double bolt seats are available to maximize the attachment location flexibility by providing approximately 2” of longitudinal adjustment. Available in mill-galvanized steel and stainless steel. Hardware is not provided.