ITEM NAME:Marine Boat 3/4" Thru Hull Fitting with Nut 316 Stainless Steel Hardware Description: 3/4" Marine Boat Thru Hull Fitting Marine-Grade 316 Stainless Steel Corrosion resistance and durability in the saltwater environment. Height: Approx. 70mm / 2.75 inch Great accessories for boat/yacht/kayak Specification: Center hole diameter: 20mm / 0.79inch Package Includes: 1 Piece 3/4" 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).3/4" Marine Boat Thru Hull Fitting. 1 Piece 3/4" Boat Thru Hull Fitting. Marine-Grade 316 Stainless Steel. Height: Approx.