1.Stainless Steel Clam Vent for Boating And Yachting,cowl vent 2.SS316OR304 3.High polished 4.Your drawings are also welcomed 1.Stainless Steel Clam Vent for Boating And Yachting,cowl vent2.The material is 316 stainless steel3.Surface:Hand polished4.We can offer 316 Stainless Steel Deck Plate T Handle key, one size fits all4.Size:3",4" Stainless Steel Clam Vent for Boating And Yachting