●Woodworking Holdfast Set: 2 x 20mm bench dog clamps, the clamp is made of quality aluminum alloy and stainless steel; Perfect workmanship,very well and neatly processed. ●20mm Dog Hole: Fit perfectly in 20mm holes and clamp very tightly without moving out of the borehole;The cam is running perfectly parallel to the pressure plate which means pressure is well distributed. ●Adjustable Clamping Pressure: 3 pressure level available, high, medium and low. Different clamping force is suitable for a various pressing materials, a variety of use scenarios. ●Easy to Use: Drill a vertical 20mm hole in your workbench top to accommodate the holdfast and drop it in place, adjust the clamping pressure until it jams tightly in the hole to hold your work firmly, then you can start your work. ●Various Applications: For applications where you need to consistently shift your workpiece; Carving, routing, sanding, finishing, and general woodworking jobs; Rough stem and uniquely hooked profile offers a strong hold on difficult workpieces