Unique, patented OMEGA bend. The innovative OMEGA screw clamp is produced entirely from BESSEY precision steel. A lightweight screw clamp that is both extremely easy-to-handle, and exceptionally robust. But the real innovation is its unique, patented OMEGA bend. This allows increased deflection of the fixed jaw, adding lateral tension to the screw resulting in considerable reduction in the resonant frequency. That means that, even when vibrations are present, this clamp will maintain its clamping pressure longer than a conventional screw. High-quality 2-component plastic handle.Pressure plates may be changed without tools.Universally applicable within the fields of wood and metal processing. Your benefits at a glance:1 Innovative OMEGA bend.The patented OMEGA bend gives you added safety. It means you lose even less clamping pressure, even when vibrations are present. 2 Versatility.Fixed arm and pressure plate are produced and tempered from a single piece of high quality BESSEY steel. Clamping is resilient and elastic. 3 Close flat clamping.The OMEGA bend applies the rail absolutely flat to the surface of the work piece. This allows clamping right into the corners. 4 BESSEY Best-Comfort-System.With BESSEY Best-Comfort-System, all applications and tasks are well within your grasp. Pressure plates can be changed quickly without the need for tools, to make BESSEY comfort still more inviting.The Bessey GM40Z2K has the following:Clamping force up to 5,000NOpening 400mmThroat depth 120mmRail 25 x 12mmWeight 1.95Kg