Rail Base Fitting 2-3/4" Round Base 30° 316 Stainless Steel - 1" ODThese Round 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 three FH fasteners (not included).*Stainless tubing with a wall thickness of 0.049”