PMD Products Engine Cylinder Dial Bore Indicator Gauge Kit 2" - 6" .0005" Range 2.000"-6.000" diameter, .0005" graduations, 6" depth For quick transferable accurate inside measurements Insulated Grip - Carbide Anvils - Tool weight 6.1 lbs # Includes all the necessary spacers, interchangeable extensions and a formed plastic case. Radius-ed hardened tips improved accuracy