Extend your SDS-MAX drill and core bits up to 82-1/2" with the Milwaukee® exclusive Max-Lok™;;; Connection Adapter. The easy-to-use Max-Lok Connection Adapter securely locks the two SDS-MAX shanks (bit and extension) together for increased strength. The system is designed for optimum energy transfer, so you won't lose drilling productivity, even at 82-1/2". The Adapter accommodates SDS-MAX, SDS-PLUS or spline shanks for a truly universal system that's compatible with all common rotary hammers. Max-Lok extensions range from 12-1/2" to 82-1/2". The Adapter includes the required grease (49-08-5385) to keep the system operating properly.