18mm exterior hardwood ply top .6 coats clear polyurethane varnish: 4 on top 2 on bottom. Tops are edged with vinyl T-molding, secured from the underside of the table with staples or edged with optional aluminum T-molding. Commercial grade powder coating on legs Two extra-wide wood runners on underside for stacking & protection .Runners are secured to the table tops with flush fitting, flathead bolts and recessed locking nuts Locking legs for safety. Leg assemblies are wishbone style, . All metal parts shall be thoroughly cleaned and phosphatized to enhance paint adhesion. Metal parts are to be finished with a thermofused epoxy powder coating.