The Groz Quick Action Woodworking Clamps have the quickest adjustment mechanism, where user lifts the aluminum die-cast handle to move the sliding jaw anywhere on the rail.  These clamps are manufactured from "K" section steel, which is profiled to minimize flexing and bending. Four hardened rollers in the moving head maintain a constant 90° angle under load, ensuring that the clamp remains perfectly square to the rail. 

The clamp jaws are encased in non-marring, glue-resistant polypropylene casing, providing a secure grip without damaging the workpiece. Additionally, the clamp is fitted with a plastic end stop to maintain it at the level. By removing this end stop, the movable jaw can be reversed and used as a spreader, making it very useful in building window and door frames. 

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