Strong Magnet: 60mm in diameter and 22mm in thickness, double-sided pulling force up to 300kg in total (150kg each side. Specially designed for river retrieval and magnetic fishing. Front to use the fishing magnet every time, be sure to tighten the bolt rings to prevent the magnet from being lost in the water.If conditions permit, we suggest using it with a strong glue.Use fishing magnets after securing the bolt rings with strong glue. Double-sided magnet: unique design with double-sided magnetic force, one magnet provides twice the area to catch targets. is easy to assemble with eyebolts directly into the steel base. Multi-purpose neodymium magnet: ideal for retrieving various iron-containing nickel materials underwater and a great idea for sea fishing magnet, lifting, hanging and retrieving Have fun looking for items like s than eyebolts, screws, hooks, fasteners and so on in your garage or yard. Best Coating: NiandCuandNi triple layer coating. The best coating available, which provides a shiny, rust-resistant coating, provides protection for the magnet and helps prevent chipping or cracking.