Centers: 3" (76mm), Length: 3 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 4" (102mm), Length: 4 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 5" (128mm), Length: 5 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 7" (178mm), Length: 7 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 9" (229mm), Length: 9 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 11" (279mm), Length: 11 3/4", Width: 3/8", Base Dimension: 3/8", Projection: 1 5/16"Centers: 13", Length: 13 3/4", Width: 3/8", Projection: 1 5/16"Centers: 15", Length: 15 3/4", Width: 3/8", Projection: 1 5/16"This item comes with optional 3/4" base platesIncludes Mounting Hardware