Simple Ball and Chain, constructed of a 20 lb. ball connected to a single PXDirect Leg Irons with a welded chunky 4' chain. The iron locks when a hex-screw is applied to hold the two halves together. The iron is made from 3/8" round stock with a welded rivit acting as the pivot hinge. The sizing is for use with boots. To stay on a bare ankle, it would be necessary to order a custom size, smaller than the smallest catalog size of M.