The Lockmasters LKM10KEXT Extension Kit is designed to extend the capabilities of LKM10K locks, allowing them to be used on doors up to 3-3/8" thick. This comprehensive kit includes an extended spindle, light tube, and all necessary mounting screws, ensuring a secure and precise installation. Constructed from high-quality materials, it guarantees durability and long-lasting performance. Ideal for both commercial and residential applications, this extension kit enhances the security and functionality of your LKM10K locking systems, providing a reliable solution for thicker door installations. Easy to install with standard tools, it ensures a seamless upgrade to your security infrastructure.