- SGZQKZ Professional Diamond Drill Bit Extension, designed for demanding drilling tasks. - Total length of 200 mm, ideal for increasing drilling depth in DIY and construction projects. - Made of high-strength 45 steel, ensures durability and long-term use. - Compatible with standard 1 1/4'' UNC thread, easy to install on core drills and drilling rigs. - Continuous drilling hole for water supply, improves performance and drill bit lifespan. - Precise and stable connection, ensures safe and efficient operation. - Versatile: suitable for drilling granite, concrete, glass, and bricks, compatible with diamond saws and grinders. - Solves access issues in deep or hard-to-reach areas, optimizing on-site work. - Includes one 200 mm black drill bit extension, ready to use.