Watertight deck plate includes rubber o'ring and thread cap to base connection. Made from cast 316 stainless steel. 4 Stainless steel deck plate, 6-hole pattern and star key cap make easy to open with winch handle or Buchan marine t-handle deck plate key. Buchan thistle ware vintage hand painted stoneware dinner plates made in Scotland Interior size 4, cutout 4-3/8, deck plate ring O.D. Screw-in style has a single-start, non-jamming, and no cross-threading. LEAK-PROOF DECK PLATE: It is designed with a rubber O-ring that creates a watertight seal for safety and allows it to be used for interior and exterior applications. MEASUREMENTS: Inside Diameter: 4 (102mm), Outside Diameter: 5-5/8 (143mm), Cutout: 4-1/2 (114mm), Distance Between Mounting Holes: 4-7/8 (124mm). Kayak Storage Marine Stainless Steel T-Handle Key For Deck Plate Azerbaijan Fishing Kayak MARINE-GRADE MATERIAL: Premium Series 4 Boat Hatch Round Inspection screw-in deck plate is made of anti-aging, anti-corrosive, and UV-resistant ABS white plastic with a smooth finish.