Description: Marine Grade 316 Stainless Steel Mirror polished, corrosion resistance and durable Flange Diameter: Approx. 7.9cm / 3.11 inch Neck Outside Diameter: Approx. 5.2cm / 2.05 inch Overall Height: Approx. 8cm / 3.15 inch Screw Hole Diameter: Approx. 5mm / 0.2 inch Package Includes: 1 Piece Boat Deck Floor Drain Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!