Hot racing adjustable trim tabs for the Spartan race boat. Features adjusts angle of trim tab assembly for proper hull planning during acceleration conk aluminum adjustable plates pre-drilled for mounting blue anodized includes two adjustable trim tabs specifications: weight: 0.78 oz length: 48mm (1 7/8) Width 29mm (1 5/32) requirements installation (no modification for the Spartan boat) comment use the stock 4x12 Screw to mount the aluminum adjustable trim tab set.