Final answer:
The diameter of a Half Pin must be less than one-half of the diameter of the bone in order to reduce the potential for fracture during insertion.
Step-by-step explanation:
The diameter of a Half Pin must be less than one-half of the diameter of the bone in which it's being used in order to reduce the potential for fracture during insertion. This is because a pin with a larger diameter can create stress concentrations and weaken the bone, increasing the risk of fracture.