Elevate your equipment stability with the SB 104 Hole Plug by Metro Moulded Parts. Known as a reliable "square hole cap", "tube plug", or "polyurethane block", this versatile plug is expertly crafted to fit a 1-5/8" x 1-5/8" hole with precision. Made from robust black polyurethane, its sleek design adds to its appeal for various fitting needs and aesthetic upgrades. The SB 104 boasts essential features including its strong reinforced ridges that provide exceptional grip when placed, ensuring that it remains securely in place while delivering superior sealing capabilities. Its functional design also facilitates easy installation simply press into the corresponding hole or tubing for a lasting fit. Whether you re upgrading existing contours or stabilizing new structures, the SB 104 combines practicality and style created to endure. Dive into DIY confidently knowing this part is built to standout and efficiently perform. Plus, rest assured with Metro s standout platinum warranty a commitment to quality from the first day, extended for 30 unforgettable years. Trust in durability, elegance, and peace of mind with Metro's SB 104. Transform your project today with confidence!