Amazing piece!! I had the boy in it for hours and he had no problems with it. Went to a major fetish event in town and had him in it. The collar works perfectly with a normal leash. D-ring attachments are perfect for leash or hooking at top to the ceiling. Wasn't important whether it locked or not. Fist mits take care of any thought of unbuckling on the boys part.
Very high quality piece. I've seen others and this is by far the best in terms of quality of leather, construction and wearer comfort. The padded mouth piece also makes it nice and snug so no ability to speak or move mouth.