29-1/2 in. SDS-Plus 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.