This is the tab used to mount the aluminum rub block M-188-A on funny car skid block assemblies and to the bottom rails of a dragster at the rear motor plate. The base width of this tab is 2.7" and the thickness is 1/8". The hole size is 5/16" and the height of the center line is 0.964. The distance between the center points of the two holes is 2.0".