Height Micrometer For 1.600-2.100 Inch Valve Springs Fits Most V8 Engines Reads in 0.005 Inch Increments Aluminum Black ProformMeasure installed valve spring height conveniently and accurately. Simply install the height micrometer instead of a valve spring, and then rotate the clearly engraved dial to expand the tool to seat the valve, locks and retainer. Fits most V8 engines. Sold individually. Product Details: Height Micrometer Model For 1. 600 Inch to 2. 100 Inch Valve Springs Fits Most V8 Engines Reads In 0. 005 Inch Increments; Maximum Retainer Size Of 1. 500 Inches Made