The most heavy duty C clamp made. Armstrong 78-060 6-5/8 We have a few of these available.The item "Armstrong 78-060 Heavy Duty Pattern C-Clamp 6-5/8" is in sale since Friday, April 27, 2018. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Clamps". The seller is "spacefile" and is located in Hamden, Connecticut. This item can be shipped worldwide.