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Made up of N52 neodymium magnet embedded a steel shell, it concentrates the magnetic field on the bottom and top of magnet which increase the magnetic force by 2.5-4 times compared to the naked magnet. The steel cup will prevent the magnet from crackings and chippings. Designed for heavy duty and underwater use, it can recover lost equipment, tools, ancient ferrous objects in deep water, wells, holes, also great for lifting, hanging applications. Specification 1. Material: Neodymium Magnet N52 2. Size: D2.91"*2.67"(Total height, magnet base thickness 1.1'' ) 3. Vertical Pull-force:660lb Horizontal Pull-force: 160LBS for each side(Two Side Attracting Surfaces) On Base of 1.18" thickness Steel Plate 4. Max Working Temperature: 80℃ 5. Package Included: One fishing magnet+66 feet(20m)Nylon Rope+1pcs Plastic Safty Box+ 1 pair of Golves+1pcs Carrying Bag. Note: 1.The 660lb is the vertical magnetic pull-force which makes the magnet pull away from the 1.18"thickness steel plate of a tensile tester under ideal condition. It does not mean the actual weight which the fishing magnet can lift The actual pull force will vary mainly depending on the following variables: A: Steel thickness (The thicker the steel is, the stronger the pull force) B: Attracting position (The farther beyond the center of gravity of the attracted object, the lower the pull force). C: Pulling direction (The smaller the angle taking 90° as a standard, the stronger the pull force), the Pull force in horizontal direction is only about one third of that in vertical direction)