All our hinges are cast from AISI 316 marine grade stainless steel and are heavy duty and suitable for the harshest environments. They are polished to a mirror finish.
They all have smooth countersunk holes for fastening with CSK 10 gauge self tapping screws or CSK M4 bolts.
Always use AISI 316 marine grade stainless steel fixings.
It is advisable to always pre-fill holes with excellent quality, marine grade silicone before affixing. If you are affixing to metal, it is advised to use an anti-corrosive jointing compound such as Duralac.