Features and Benefits:39” x 39” metal welding tableMade from Q345 SteelBrinell Hardness 140~160Single Mounting SurfaceExpandable2 ton weight capacityIndustry Standard 28mm Mounting holes100mm hole spacingEtched Position MarksThe WJT-3939 welding jig table is perfect for thos small shops looking for a good economical fixture mounting system. It features one solid mounting surface that has a flatness of +/- .0025" and a Brinell hardness rating of between 140 and 160.