These round nipple clamps are quite exceptional! This high-quality sex toy has four individually adjustable screws, made from 100% body-safe material (steel). The screws have a length of 23.5mm, the screw-head has a diameter of 10mm. The inside diameter of the ring is 23mm and it is 10mm high with a material thickness of 3mm. When all four screws are screwed in to-the-max, the remaining hole for the nipple has a diameter of just 4mm. Each nipple clamps has a weight of 39g.