Put the squeeze on your sub with this Stainless Steel Nipple Vise. Place the opening over their nipple and tighten the adjustable clamp a little for some light pressure or a lot for a more disciplinary pinch. This diminutive device packs a lot off nipple gripping power. Measurements, 2.75 inch overall length fully opened, 1.5 inches wide, Clamp adjusts internal opening from 0 to 0.97 inches.
Stainless Steel Nipple Vice