6 HDL PROTO EXTRA HEAVY DUTY C-CLAMP. Full length forcing screws provide greater versatility with the minimum capacity always being -inch0? Heavy-duty threaded hub provides maximum screw support. Forcing screws have a square head to be turned with a wrench. Forcing screws have a hardened tip.The item "PROTO 6 HDL EXTRA HEAVY DUTY C-CLAMP" is in sale since Friday, September 4, 2015. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Clamps". The seller is "bearingman42" and is located in Pittsburg, California. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia, South africa, New Zealand, Egypt, Reunion.