1、[20mm Hole Diameter] Measuring 230mm in length with a 20mm aperture, this tool rest base is designed for stability and precise in lathe operations. 2、[Sturdy Construction] This lathe tool holder base is made of cast steel, providing superior strength, impact resistance, and durability for long lasting use. 3、[Rust and Oxidation Resistance] The surface of the base is treated for rust and oxidation resistance, offering excellent shock absorption, wear resistance, and impact resistance. 4、[Smoothly Operation] Guide your fingers along the edge of the hardened rod, providing a smoothly surface for rotating tools to glide on your fingers, allowing for comfortable finger control during work. 5、[Easy to Use] Simplify the learning curve of turning without the need to memorize complex angles. Suitable for woodworking enthusiasts or DIYers of all skill levels.