This product is a set of 4 stainless steel 316 door strap hinges, each with 6 mounting holes.The hinges are cast and feature a mirror polish finish.Each hinge measures 30 mm in width and 152 mm in length.They are designed for marine applications and are compatible with boat hardware systems requiring a 6-hole strap hinge configuration.The material and construction support use in saltwater environments.Installation requires flush-mounting with appropriate fasteners.These hinges serve as direct replacements for existing 30x152 mm, 6-hole, cast 316 stainless steel strap hinges on marine doors, hatches, cabinets, and similar applications.