The BESSEY solid surface seaming tool's twin vacuum cups secure the clamp to any smooth, non-porous material such as solid surface, SSV laminate, polished marble & granite and eliminates the need for glue blocks. The PS130's suction cups are made from rugged high-pressure aluminum alloy with the highest quality rubber diaphragm. The large 210 mm (8-1/4 Inch) suction cups can create up to 265 lbs of clamping force, making this a very useful tool for joining larger sections of material. The large diameter ACME type lead screw smoothly pulls the two work pieces together. Come with the ergonomic shaped wood handle. A great time saver. BESSEY. Simply better.