This 5" (12.7cm) steel Baby 5/8" (16mm) pin is designed to be mounted in the head of a grip head or grip arm and still have a few inches sticking out of the head where a light fixture or any other accessory with a baby receiver can be mounted. The combination of a grip head and grip arm give flexibility to position light fixtures or any accessory with a baby receiver virtually anywhere. The End Collar will save light fixtures or accessories by preventing the pin from slipping through the grip head if it ever loosens unexpectedly.