This iron belt is adjustable over a 4" waist size range. It is "small" since the iron strap of which it made is 1" wide rather than 2" as in the "regular" size belt. The lock is a standard hex-key screw-lock though the hex-key is of a smaller size than the "standard" Fetters key. Three loops on the belt (one on each side and on the back) allow for fastening to a fixture or to handcuffs. The belt has four segments and thus can adjust, somewhat, to changing geometry of the waist.