These heavy-duty clamps feature a dangling ring at their base that affords you countless bondage options. Attach a chain from one ring to another that will swing with their movements and provide a slight tug, or a set of hanging weights for even more of a pull. The rings are perfect for attaching independent ropes or chains to create any nipple torture setup that you can imagine. The clamps are highly adjustable via their threaded barrels - no forgiving spring-loaded clamps here! Just screw them down tight for unrelenting pressure! Measurements: 11.5 cm overall length (including rings), 2.8 cm inner diameter ring pulls, 1.4 cm diameter barrels