WINMAX Dial Bore Gauge is a professional and high-quality tool for measuring the accurate inner diameter of a bore. The tool is perfect for measuring the engine cylinder bore size and is compatible with engines ranging from 2 inches to 6 inches. The Dial Bore Gauge comes with a high-precision dial indicator that measures the diameter of the bore with high accuracy to ensure that you get the correct measurements. The compact design of the gauge makes it easy to use, and the WINMAX brand ensures long-lasting durability and reliability. YOU SEE ONE ITEM IS MISSING