This beautifully designed Open Circles Steel Collar looks great around your neck. Put it on by loosening the allen screw with the allen key provided, once around your neck tighten the allen screw once it is securely in place. There is a large O-ring crowned with a fancy jewel. This item can be used as a kinky toy or as a jewel to complete your sexy outfit.This is a medium sized steel collar with an inner diameter of 11.5 cm. Made from Kiotos stainless steel, clean after each use with Kiotos Toy Cleaner for extra hygiene.