ITEM NAME:1" Hose Barb Polished 316 Stainless Steel Boat Thru Hull Fitting Description: 1" Marine Boat Thru Hull Fitting Marine-Grade 316 Stainless Steel Corrosion and durability in the saltwater environment Height: Approx. 103mm / 4.0 inch Great accessories for boat/marine/yacht/kayak Specification: Top hole diameter: Approx. 28mm / 1.1 inch Bottom hole diameter: Approx. 18mm / 0.7 inch Package Includes: 1 Piece 1" Boat Thru Hull Fitting Note: 1. Please check as much as possible to make sure the item is the one that you need. 2. Please allow 0.5-1 inch difference due to manual measurement.(1 inch=2.54cm).Great accessories for boat/marine/yacht/kayak. 1" Marine Boat Thru Hull Fitting. 1 Piece 1" Boat Thru Hull Fitting. Marine-Grade 316 Stainless Steel. Height: Approx.