Nipple clamp
In their simplest form, nipple clamps are a variation on an alligator clamp, often with an adjustable spring or locking device. The tips should be covered with cork or soft vinyl or rubber, both for traction and to give some cushioning to protect the skin and tissues.
Another type of clamp is based on a forceps design. They look like a pair of scissors, and have a locking device between the arms to hold them in place.
Tweezer type clamps are just miniature tweezers or tongs encircled by a metal band that slides up their length to tighten them. Their ends should also be covered with rubber or vinyl cushions.
Clover clamps are a more complicated apparatus that resembles a pair of pliers with two round, flat pads that compress the nipple. Each of the clamps is attached to a chain in such a way that pulling on it tightens the grip of the clamps. Clover clamps were originally used for holding silk while it was drying.
