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Keep your sub under control with our Single-Hinge Thick Metal Collar & Nipple Clamps, complete with a sturdy O-ring with hanging nipple clamps. Ideal for more experienced bondage players, this collar hinges at the side and is kept shut by a screw which can be tightened with the included allen key. Since this collar is made from metal, it is easy to clean and extremely durable for whatever you might have in mind for your submissive. The nipple clamps are rubber-tipped for added comfort and easily used by pinching the sides.We recommend measuring the circumference of the intended wearer's neck and comparing to the size of the collar before use to prevent discomfort or injury.