The OEMTOOLS 25355 24 Inch Straight Edge’s precision-ground edge inspects engine blocks and cylinder heads for distortion, making it the perfect addition to any shop's straight edge set. This 2' long feeler gauge tool also allows you to check for distortion or flatness on fly wheels, main bearing saddles, cam bearing saddles, cam covers, and bell housings for every application from small engines up to heavy duty diesel engines. The 24" inch long straight edge design features a precision ground edge accurate to +/-0.001 inch for inspections, making it one of the top precision instruments on the market for accuracy. It is nearly impossible to visually inspect for flaws or feel a cylinder head for flatness. This engineer straight edge provides the best way to measure your cylinder head correctly. The heavy-duty automotive steel straightedge is made in the USA from 1/4 inch cold rolled steel for extra strength and durability, and features a durable black powder coat finish that resists rust and corrosion. This safety straight edge comes in a reusable protective bar edge and includes a convenient hang hole for easy storage. Choose the OEMTOOLS Machine Straight Edge for results you can rely on.