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MAGNET SPECIFICATIONS Size : 0.375 x 0.125 inch (Outer Diameter x Thickness) Metric Size : 9.525 x 3.175 mm Countersunk Hole Size : 0.242 x 0.136 Inches at 82° Screw Size : #4 Grade : N48 Pull Force : 4.1 lbs Coating : Nickel-Copper-Nickel (Ni-Cu-Ni) Magnetization : Axially - Pair Material : Neodymium (NdFeB) Tolerance : +/- 0.004 in Max Operating Temperature : 176 F Quantity Included : 36 Countersunk Rings Sold in Matched Pairs Each set of countersunk ring magnets includes 18pcs with the countersunk hole on the north pole, and 18pcs with countersunk hole on the south pole. This allows you to pair them together to create magnetic latches, fasteners, and other closure mechanisms.