The Milwaukee Plus-Lok SDS Plus 18" Extension (48-20-6945) provides you with increased access in tough to reach areas and around obstructions. The extension is universal, fitting all brands of SDS Plus rotary hammers and accessories including but not limited to drill bits, chisels, core bits, and anchor installation solutions. The PLUS-LOK SDS Plus extension connection mechanism has a small profile, allowing you to drill deep through holes with drill bits 7/8" and larger. The auto-insert mechanism allows you to perform a tool-free connection and provides you with ease of use. By increasing accessibility and decreasing the number of drill bits needed to complete a job, the universal SDS Plus extension bars allow you to Reach More and maximize your productivity.