This HD50 adjustable workbench clamp kit is used as workbench vise in your workshop. It has 19mm(3/4inch) or 20mm stainless steel bench dogs to match your workbench. The CNC machined stainless steel leadscrew is drove via a standard pawl wrench to clamp the workpiece. Plus the beautiful brass clamp block, the HD50 is one of the very useful kits in your workshop.