Based on vintage surgical clamps from 1909, these Kinklab Mandible Body Clamps adjust with screws- making them more adjustable from light to tight than the traditional Japanese Clover clamps they resemble, as well as tweezer and other spring-style clamps. Can be used on the nipples, tongue, or any other sensitive areas. Gap between tips adjusts from 1/16 to 1/2 (0.16cm - 1.27cm) wide.