If you are looking for a heavy duty C-Clamp, the Wilton 145C 5″ Iron C-Clamp is an excellent choice. With a throat depth of 3 in., this black oxide spindle has a max opening of 5 in. The 1,225 lb clamping pressure means that you can trust this c-clamp to hold strong. It has a ductile iron body and black oxide finish. For your next project, get yourself the Wilton 145C 5″ Iron C-Clamp and rest assured that it will get the job done right.