Rail Base Fitting Rectangular Base 90Adeg 316 Stainless Steel - 1-7/8" x 3-3/16" - 1" ODReplacement rail base fitting. Features: Constructed of corrosion resistant investment cast 316 stainless steel. Stainless tubing with a wall thickness of 0.049" Installs with four FH fasteners (not included). Sold as an individual WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.