The OEM TOOLS 25355 24 Inch Straight Edge features a precision ground edge designed to inspect engine blocks and cylinder heads for distortion, making it the perfect addition to a machinist's toolbox. Our cylinder head tool also inspects for distortion or flatness on fly wheels, main bearing saddles, cam bearing saddles, cam covers and bell housings. These precision machined tools are designed to work with a sensor gauge to perform precise automotive repairs. This cylinder gauge tool features a precision +/- 0.001 inch ground edge for inspections, making it one of the highest precision instruments on the market for accuracy. It's nearly impossible to visually inspect for defects or feel a cylinder head for flatness, and our precision tool provides the best way to measure your cylinder head correctly. This heavy duty automotive straight edge steel tool is made in the USA from 1/4 inch cold rolled steel for strength and durability, and this precision steel tool features a durable black powder coat finish that resists rust and corrosion. Our 24-inch straight edge tool includes a convenient hanging hole for easy storage, and this mechanical straight edge comes in a reusable protective edge. and our precision tool provides the best way to measure your cylinder head correctly. This heavy duty automotive straight edge steel tool is made in the USA from 1/4 inch cold rolled steel for strength and durability, and this precision steel tool features a durable black powder coat finish that resists rust and corrosion. Our 24-inch straight edge tool includes a convenient hanging hole for easy storage, and this mechanical straight edge comes in a reusable protective edge. and our precision tool provides the best way to measure your cylinder head correctly. This heavy duty automotive straight edge steel tool is made in the USA from 1/4 inch cold rolled steel for strength and durability, and this precision steel tool features a durable black powder coat finish that resists rust and corrosion. Our 24-inch straight edge tool includes a convenient hanging hole for easy storage, and this mechanical straight edge comes in a reusable protective edge. and this precision steel tool features a durable black powder coat finish that resists rust and corrosion. Our 24-inch straight edge tool includes a convenient hanging hole for easy storage, and this mechanical straight edge comes in a reusable protective edge. and this precision steel tool features a durable black powder coat finish that resists rust and corrosion. Our 24-inch straight edge tool includes a convenient hanging hole for easy storage, and this mechanical straight edge comes in a reusable protective edge.