The patented ratchet-action closure and speed release clamp of the Pro Mechanic repair stand is capable of managing any bike frame, up to 75lbs (34kg) and tube diameter up to 2.6″ (6.6cm). This replacement clamp head comes fully assembled with hinge pin and hinge pin fixing bolt. Includes entire clamp head assembly, hinge pin, fixing bolt, clutch body, clutch cups and rear tri knob.
See this video for installation of a similar clamp head assembly: Removing the head off of your repair stand