SeaLux Deluxe Elliptical Polished Stainless Steel Boat Grab Rail/Handle/Handrail center to center 9", 12", 16", 18" Constructed of polished 304 stainless steel, this rail measures approximately 10-1/4" L x 1-1/4" W x 2-5/8" H (2)x 5/16" dia. x 1" long threaded mounting holes with 9" apart center on center. Overall Length: 10-1/4" Tubing: 1" W x 3/4" H elliptical Clearance: 1- 7/8"