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 inch to 1/2 inch (0.16cm - 1.27cm) wide.