63 in. SDS-Max extension to be used with the Max-Lok system (48-20-6950). Bullets: versatility: system is compatible with any rotary hammer for drilling in tight spaces; efficiency: save time and money by leveraging your shorter, less expensive bits and rotary hammer; maximum energy transfer: maintain drilling productivity, even at 82-1/2 in.; easy to use: the connection adapter's sliding sleeves offer twist and lock security.