Deltron Products pro series custom machined piston dome thickness gauge with black satin finish.Made of 3/4″ thick 6061 aluminum heavy duty design and tips the scale at 5lbs. Its fully adjustable and has dial indicator with 2-3/8″ face and 2″ total travel. Measure piston crown thickness, valve pocket area, can also measure any number of other items. Assembly is required. Please e-mail with questions.