Automatic lock open folding legs helps to prevents accidents. Heavy duty 1" Steel legs and one piece Strong steel frame / apron supports the top. CFA Adjustable TFL Folding Tables 30x60 Medium Oak Thermal Fused Laminate (TFL) is a resin infused laminate not glued on like high pressure laminate, it is fused to the board using a heat treatment process. Heavy Duty 3/4" thick top is sealed on both sides preventing moisture from entering the table and causing warping.