Shop › 3.5"x3.5"x.25" aluminum Baseplate Image 1 of 1 3.5"x3.5"x.25" aluminum Baseplate $4.00 3.5"x3.5"x.25" aluminum Baseplate.3125” hole diameter Quantity: Purchase Added! 3.5"x3.5"x.25" aluminum Baseplate.3125” hole diameter