Get dialed in with COMP Cams dial bore gauge combos. Whether you're a beginner or a pro engine builder, you can measure rod bores, main bearings, and cylinder bores with precision. Setting the bore gauge to zero with a master or micrometer allows you to see the difference in the bore that you are measuring so that a precise measurement can be performed. COMP Cams indicators can automatically zero in at any position and convert inch/metric with the push of a button. A precision dial indicator, bore gauge, and special adapter and anvil/shim kit are included. Plus, everything is packaged in a great wooden box to keep it all organized. Engine building is precision work and COMP Cams has the tools to make precision power.