This is a devious little device consisting of a steel ring that sits around the nipple with a steel frame housing a clover nipple clamp and screwing device.
Once fitted it is the tension on the nipple being pulled that holds it in place, whilst slowly turning the dial will pull and stretch the nipple to achieve the desired effect.
As with all clamps keep lubes etc away from the areas where these are being applied as they will keep slipping off with even a sniff of lube.
The clamps are removable allowing you to use your own favorite clamps or similar.
Sold in pairs.