A tweezer clamp consists of two short lengths of metal, no more than 5–10 cm (2–4 in) in length. The two lengths are fixed together at one end and open at the other end (just like a regular tweezer). The open ends are curved slightly to improve their ability to grip the nipple. Typically, they have a small 1 cm rubber sheath over this end to protect the nipple from damage and reduce slippage. A small ring wraps around the two pieces of metal and is used to adjust the tension. The user places the two sides of the metal head either side of the nipple, then by sliding the ring along the clamp shaft towards the nipple, causes the two halves to close tighter together. Tension can thus be adjusted depending on the location of the ring — the closer the ring is along the shaft toward the nipple, the tighter the clamp.
Read more about this topic: Nipple Clamp