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 naked magnet from crackings and chippings. Designed for heavy duty and underwater use, it can recover lost equipment, tools, ancient ferrous object and others in deep water, wells, holes, also great for lifting, hanging applications. Specification 1. Material: Neodymium Magnet N52+A3 Steel+Black Resin+nylone 2. Fishing Magnet Size:D67mm(Diameter),Rope Size:D0.295''(Diameter7.5mm)*32foot (Length 10m) 3. Vertical Pull-force 200kgHorizontal Pull-force: 50kg for each side(Two Side Attracting Surfaces) On Base of 30mm thickness Steel Plate 4. Max Working Temperature:80℃ 5. Package Included: One fishing magnet+ 10m lifeline rope+Carabiner. Note: 1.The 200kg is the vertical magnetic pull-force which makes the magnet pull way from the 30mm 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)