The patented Supergrip system is a simple but effective way to hold rigid signs firmly in place. This technology is then used in conjunction with a variety of mounting options to provide an extensive range of cost-effective display solutions. Manufactured from co-extruded PVC, This Upright Sign Holder with 57mm Base accepts material up to 3.75 to 5mm thick, Dimensions 2440 x 13 x 57.