Item Name: Cover Billet Alignment Tool Alignment Tools for Rear Engine Covers to centered. Material:Billet aluminum & Quality steelAlign the seals perfectly concentric to the front diameter on the balancer hub and rear sealing surface on for proper seal function and longevity.Simple yet powerful.Function: Used to align the rear cover so that the rear main seal is centered when installed.Easy installation with this tool, saving your time and energy !100% Brand New and High Quality !Size:As the picture shownFits for LS Series Engines 4.8 5.3 5.7 6.0 for LS1 for LS2 for LS3 for LS6 for L99 for LS9 for LSA for LQ4Package Include:1PC Rear Cover Billet Alignment ToolNote:1.Please allow 1-2cm error due to manual measurement.