These clamps have vinyl-coated ends, linked chain, and a sliding ring to adjust the tightness anywhere from just enough to hold them on all the way up to a really severe tit torturing pinch. They stay on, they are easy to use, they look good, and they can be heavy or light or anywhere in between. Measurements: 62 cm in total length, clit chain measures 40 cm in length. Clamps open up to 2.5 cm in width and close completely