Engine Cylinder Bore Dial Indicator Gauge Kit METRIC 50mm - 160mm .01mm METRIC Gauge Readout: Range 50mm - 160mm diameter, .01mm" graduations,150mm 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