Antique reproduction stainless steel head cage. Hinged at side and opens with allen wrench type key. Inside is lined with rubber material. 1" rings are attached at top and at front and back of neck. Available in medium and large. Medium is 12" high and 9" back to nosepiece; inside perimeter of neck opening is 16 3/4". Large is 13" high and 9.5" back to nosepeice; inside perimeter of neck opening is 18". One allen wrench type hex key included.