Height Micrometer For 1.400-1.800 Inch Valve Springs Most 4 and 6 Cylinder Engines Aluminum Natural 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 4 and 6 cylinder engines. Sold individually. Product Details: Height Micrometer Model For 1. 400 Inch to 1. 800 Inch Valve Springs Fits Most 4 And 6 Cylinder Engines Reads In 0. 005 Inch Increments; Maximum