Abstract: A clamping apparatus comprises a frame member, a slider member and a locking member all adapted for manufacture from high strength plastic materials by means of injection molding. The frame member comprises an elongate bar portion and a jaw portion extending perpendicularly to the bar portion. The slider member includes an aperture portion which receives the bar portion of the frame member and a depending jaw portion. The locking member extends through the aperture portion of the slider member and functions to lock the slider member against movement along the bar portion of the frame member.