• BEST COATING - Ni+ Cu+ Ni Triple Layer Coated. The Best Coating Available, which Provides a Shiny and Rust Resident Coated steel cup provides protection for the magnet and helps to prevent chipping or cracking. • MULTI USE - Unique design with Countersunk Hole and Eyebolt Great for salvaged of vous iron-containing nickel material underwater and Good idea for magnet fishing, lifting, hanging, retrieving applications. Have fun to searching items like eyebolt, screens, hooks, fasteners