Features and Benefits:?Easy to use: The connection adapter's sliding sleeves offer twist and lock security?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"?Versatility: System is compatible with any rotary hammer for drilling in tight spaces29-1/2 in. spline extension to be used with the Max-Lok system.