Patterned after pre-19th century prison irons, this steel Collar is hinged and has welded loops on the sides, and a single chain link next to special locking device in the front. Weighs in at about 1 lb. He'll know he's Really been collared after wearing this for a few days. Lots of attachment points. No need for a padlock with our tightening hex screw locking device. No pinching when screwed shut. Made exclusively for Mr. S Leather & Fetters USA