Rail Base Fitting Rectangular Base 30 316 Stainless Steel – 1-7/8″ x 32-3/16″ – 1″ ODThese Rectangular Rail Base Fittings include set screws where appropriate. Set screws can be purchased separately (299999-1). Requires 1/8″ Allen wrench to install. Constructed of corrosion resistant investment cast 316 stainless steel. Installs with four FH fasteners (not included). *Stainless tubing with a wall thickness of 0.049. Features:Investment Cast 316 Stainless Steel30 Rectangular Base1″ Tube ODBase: 1-7/8″ x 3-3/16″Fastener: 1/4″ FHWARNING: 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.