Rail Base Fitting Rectangular Base 30deg 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 Steel 30deg Rectangular Base1 Tube ODBase: 1-7/8 x 3-3/16Fastener: 1/4 FH