Two lengths of extrusion with jointing piece to give a maximum working length of 100 inches 2540mm reduced length for easier transport and storage clamps can slide along each extrusion maximum material clamp thickness 32mm adjustable friction washer on clamps prevent clamp from sliding too freely one extrusion has dual metricimperial scale can be combined with varijig parts whats included1 x 56 alloy extrusion with scale1 x 56 alloy extrusion1 x connecting block1 x hex key 4mm2 x sliding clamps