Faithfull heavy duty clamps manufactured from a high quality carbon steel bar with large malleable iron clamping heads clamp bars have a black oxide coating with powder coated heads for complete rust protection other features include a high grade steel mainscrew with a wear resistant acme thread which applies pressure quickly and smoothly tail slides are easily adjusted and secured by a steel pin passing through one of the locating holes tail slide and heads are flat bottomed so that the clamp c