ITEM NAME:Boat Hand Rail Fittings - 90 Degree 7/8" Rectangular Base - Stainless Steel Description: 316 Marine Stainless Steel. Maximum corrosion resistance and durability in the saltwater environment. Mirror finished Rectangular Base For 7/8" 22mm ID tube. Specification: Base Size: Approx. 76x43mm/3.0x1.7inch Hole Diameter: Approx. 5mm/0.2inch Package Includes: 1 Piece Rail Fitting.Rectangular Base. 1 Piece Rail Fitting. 316 Marine Stainless Steel. For 7/8" 22mm ID tube. Specification: Base Size: Approx.