EXTRA STRONG STAINLESS STEEL WORKBENCHES GET THEIR STRENGTH FROM THE SUBSTANTIAL WOODEN CORE ENCLOSED IN STAINLESS STEEL. THESE WORK BENCHES FEATURE A PARTICLE BOARD CORE THAT IS 1-1/2"" THICK WITH A PHENOLIC BACKER. 16 GAUGE TYPE 304 BRUSHED STAINLESS STEEL IS CORROSION RESISTANT AND HAS POLISHED SMOOTH SAFETY EDGES AND CORNERS. FIXED HEIGHT WORK BENCHES ARE 39-3/4""H. LEGS ARE REINFORCED WITH CROSS BRACING FOR EXTRA STRENGTH AND RIGIDITY. MOBILE WORK BENCH LEGS FEATURE REMOVABLE DUPLEX KNOCK-OUTS TO ACCEPT ELECTRICAL OUTLETS (NOT INCLUDED). FRAMING IS FINISHED WITH SCRATCH RESISTANT GRAY BAKED ENAMEL. MOBILE BENCHES ARE EASY TO MOVE ON 5"" CASTERS (2 RIGID 2 SWIVEL WITH BRAKES).