Pro Series Crankshaft Stroke Gauge fixture has a black anodized finish and is adjustable leg up-rights from 4-1/2″ to 7-1/2″ outside to outside (see photos) and up to 4.75″ stroke. Starrett 5″ travel dial indicator is included part No. DEL-25-5041J . No math required with direct readout once calibrated. Fixture use a collect system for adjusting the dial indicator height that will not damage the stem housing. Please e-mail us if you have any questions.