Marine Grade Heavy Duty Stainless steel shortside hinge 2-1/4" Materials:The boat shortside hinges are made of marine grade 316 stainless steel.maximum corrosion resistance and durability in the saltwater environment. Application:Boat hardware hinges for interior hatch,locker,hatch windshield,deck hatch,compartment,doors and more. High quality:Marine shortside hinges good construction, flexibility,Solid metal slab, very strong,mirror polished surface. The size:Heavy duty hinges length:2-1/4 inch (57mm), width :1-1/2 inch (38mm),thickness: 3/16 inch (4.5mm).nstallation screw,it is very easy to install. Length:2-1/4 Inch (57mm), Width :1-1/2Inch (38mm),Thickness: 3/16 Inche (4.5mm). Easy to Install:Marine grade casting hatch hinge with installation screw,it is very easy to install.