ITEM NAME:43mm Cut out Marine Yacht Boat Deck Drain Hardware 316 Stainless Steel Description: Materials: Marine Grade 316 Stainless Steel Surface diameter: approx. 62mm/ 2.44 inch Cut out: 43mm/ 1.7 inch. Screw hole diameter: 4mm/ 0.16 inch. Bottom Ring diameter: 23mm/ 0.9 inch. Package Includes: 1 Piece Boat Deck Drain.Materials: Marine Grade 316 Stainless Steel. 1 Piece Boat Deck Drain.