Stainless Steel Inspection Hatch Deck Plate 316 by MarineNow (6") Go to amazon.com Related posts Top 10 best stainless steel hatches: Which is the best one in 2022? FeatureStainless Deck Plate Inspection Hatch316 Marine Grade Stainless SteelMirror PolishedDiameter of outer ring - 196.5 mm (7.73")Diameter of inner plate - 161 mm (6.37")