Engine Piston Dome Thickness Checking Tool Mounting Fixture and Dial Indicator ProformWho would dare to modify piston domes or to fly cut valve pockets without knowing how much material there is to work with? This simple tool includes a 0. 001 inch dial indicator and a contact point that permits measurement of the most complex dome shapes. An essential tool for every well equipped machine shop. Sold individually. Product Details: Engine Piston Dome Thickness Checking Tool Includes Mounting Fixture and Dial Indicator Which Reads In 0.