Prevent damage to your rod holder or your boats gunnel with C.E. Smiths 70 Series Rod-Holder Backing Plate. Made of 316L stainless steel, this plate distributes mounting-bolt pressure evenly over 30 times more surface area than when using standard washers alone. Compatible with all 70 Series rod holders. 4H x 5.25W x 0.16D. Type: Rod Holder Backing Plates.