SM81.5812M8 Threaded Hole + Rod with Eyelet Neodymium magnetic system with 58mm diameter, 12mm thickness and M8 threaded hole. It contains an N35, nickel-coated magnet. WARNING! This magnet is extremely powerful. To avoid the risk of crashing your fingers or other serious injuries, please handle it with maximum care when approaching metal surfaces. The pulling force is 160,00 Kg . Max temperature 80° C Axial magnetization