Features: 1. High Quality Material: Made from anodized aluminum alloy, this woodworking table limit block ensures strength and durability to withstand the rigors of any workshop. 2. Precision Aperture: With a precision aperture of 18.9mm¡¦ 0.01mm or 19.9mm¡¦ 0.01mm, it is ideal for a 19mm or 20mm table hole, providing a snug and secure fit. 3. Versatile Usage: This workbench peg brake bench clamp provides an extra hand when working on a variety of woodworking tasks, adding convenience to your DIY projects. 4. Stainless Steel Screws: Equipped with stainless steel screws for secure installation and longevity of use. 5. Easy to Install: This guide rail track is easy to install, making it a practical addition to any workspace. Specifications: Color: Silver Material: Aluminum alloy Surface: Anodized Screw Material: Stainless steel Aperture: 19mm or 20mm Package Included: 2 x Dog Hole Woodworking Table Limit Blocks (Size as your selection)