Sea Dog Line 201914 Stainless Steel Semi-Concealed Hinge Pair (2) Surplus 132-139 Stamped 304 Stainless Steel. Designed to be mounted on the back surface of a door having a corresponding 3/8" offset mortised into the edge of the door. #6 FH Fasteners 2-3/4" & 1-1/2" Hinge Bases See Dimensions in Photo #2