April 17, 2015 Online Store No Comments +3 Clamp Plate Base 15702 C$20.00 In stock Quantity: 1 Add to Bag Product Details Brand: Welder Series MPN: 15702 Thickness: 3/8" Hole size: 4 holes 1/2", center 9/16" 4 holes are 1/2", center hole is 9/16". This clamp plate will not fit original u-bolts. Grid is picture 1" x 1". Save this product for later Favorite