Bessey PS55 Solid Surface Seaming Tool, Red/Black/Silver The vacuum cups on this Solid Surface Seaming Clamp instantly secures the PS55 to any smooth Cup made from rugged high-pressure aluminum alloy with the highest quality rubber diaphragm The vacuum operating lever- activates and locks the vacuum seal on the work surface For clamping and positioning components with a smooth surface, such as ceramic, granite, Corian, plastic, sheet metal and glass, which require low clamping forces (up to 260N) Twin leveling toggles make surface alignment easy Ergo wood handle Steel threaded spindle is precision machined cold drawn profile guide rails for smooth powerful clamping