C.E. Smith Plate f/70 Series Rod Holders Backing. When the rod holder is under extreme load regular nuts and washers can concentrate stress and cause spider cracking around your rod holders or perhaps even tear through causing severe gunnel damage. Smith backing plates distribute mounting bolt pressure evenly over 30 times more surface area than with standard washers alone. 2 sizes one for 70 series and 80 series rod holders. Each size fits all 3 models of the Series. Specifications for C.E. Smith Backing Plate f/70 Series Rod Holders: Manufacturer: C.E. Smith Color: Black Package Contents: C.E. Smith Backing Plate f/70 Series Rod Holders C.E. Smith 53673: Plate f/70 Series Rod Holders Backing