ONE SIZE FITS All! Locks Bully Sticks, Yak Chews and Antlers in place! Comes with Regular Screw Key and Retractable Screw Key REGULAR SIZE: Bully Stick holder - Dog treat holder - Safety Device that fits most bully sticks and hard treat sticks from 1/8" wide to 1 1/4" wide MINI SIZE: Bully Stick holder - Dog treat holder - Safety Device that fits most bully sticks and hard treat sticks from 1/8" wide to 1" wide Multi-Functional Dog Toy and Safety Device! Made from non-toxic chew resistant durable natural rubber designed for dogs that like to chew. Screw made from tough natural Food Grade Nylon. Safety Device helps prevents choking and stomach blockage in dogs when eating treat sticks. Quality Inspected, Assembled and Packaged in the USA. Globally sourced material. INSTRUCTIONS: Remove all packaging, place treat in center of holder and tighten screw until treat is securely locked in place. Supervise Use The Bully Lok is Dishwasher Safe Discard if Damaged