Ring Neodymium Magnetic 8*3 mm

From the shop's description

dimension: Diameter :8mm Width :3mm Hole :3mm Material: Grade N45 Sintered NdFeB neodymium rare earth magnet Remanence: 13,500 Gauss or 1.35 Tesla Pulling Force: 5.25 LBS Pole Orientation: Axially magnetized, the poles are on the two flat surfaces Coating: Ni+Cu+Ni 3 layer coated, the best coating available Tolerances: All +/-0.002″ with coating. Application: As a small but very strong magnet, this neodymium magnet is used a lot in industries as creative applications such as prototyping, theater setups, furniture making, exhibition displays, crafting and packaging boxes or folders.