Rail Base Fitting Rectangular Base 60° 316 Stainless Steel - 1-7/8" x 3-1/4" - 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”