These simple 19mm reinforced nylon Bench Dogs will help make your next project easier. Included with each Bench Dog is a solid rubber Bench Brake that can be placed on top of the Bench Dog for a solid, non-slip work surface – perfect for routing and sanding. Technical Specifications For Use with 19mm diameter Bench Dog hole Material Durable, impact-resistant plastic Includes (4) Bench Dogs (4) Bench Brakes