CBM Motorsports CBM-10449 LS Series Front and Rear Cover Alignment Tool Fits all LS series engines. Comes as a kit with front and rear cover tools. Helps align the front and rear engine covers to make sure the cover is centered. A centered cover means less of a chance for a seal to leak A must have for engine builders and mechanics Billet aluminum, not cast. Very tight tolerances for a perfect alignment Made in house by CBM Motorsports in the USA