Mainly made up of N52 neodymium magnet and a steel shell, it can <b>concentrate</b> the magnetic field on the<b>bottom</b>of magnet which<b> increase</b> the magnetic force by<b> 2.5-4 times </b>compared to the naked magnet .<br> The steel cup can <b>prevent</b> the naked magnet from <b>scratch and chipping</b> during grabbing and clamping. <br> It is designed for<b> heavy duty and underwater use</b>and helps to<b> recover</b> lost equipment, tools, fishing tackles and other ferrous objects in deep water, wells, holes. It is also great for magnet lifting, hanging applications. <br> <br> <b> Specification </b> <br> <br> 1. Material: Neodymium Magnet N52+A3 Steel+Black Resin<br> <br> 2. Magnet Size: Diameter 2.36''*Height 2.26''(Including eyebolt , thickness of magnet base : 0.79'') <br> <br>3. Rope Size:Diameter 0.196''*Length 66 Feet<br> <br> 4. Vertical Pull-force:400lb Horizontal Pull-force: 70lb On Base of <b>1.18" Thick Steel Plate</b> <br><br>5. Max Working Temperature:80℃<br><br>6. Package Includes: One fishing magnet+ one M8 eyebolt+66 Foot high strength durabale Nylone Rope.<br><br> <b> Note:</b><br> 1.The magnetic force 400lb isvertical</b> pull-force which make the magnet <b> pull way</b> from the thick 1.18" steel plate of a tensile tester under ideal condition. <b> The actual pull force</b> will vary mainly depending on the following variables: <br><br> A: <b>Steel thickness </b> (The thicker the steel is, the stronger the pull force) <br><br> B: <b>Pulling direction </b> (The smaller the angle taking 90° as a standard, the stronger the pull force), the Pull force in <b>horizontal direction</b> is only about <b>one third </b>of that in<b> vertical direction) </b><br><br> C: <b> Attracting position</b> (The farther beyond the center of gravity of the attracted object, the lower the pull force) <br><br>