Jaw and Jaw Swivels in marine grade stianless - A4 steel. Connect items to either end of the swivel. The swivel rotates to prevent twisting. For example: Punch bag in a gym, anchor chain, suspended (egg) chair. The pins simply unscrew. Available in sizes 5mm, 6mm, 8mm, 10mm, 13mm, 16mm and 19mm sizes, where the size refers to the diametr of the pins.