J.w. Winco 54.1-nd-8 retaining magnet assembly rod-shaped w/ smooth finish – .31″ diameter, brass gn 54.1 magnets are a shielded magnetic assembly. The configuration of magnetic and iron poles is known as a sandwich magnet assembly. These retaining magnets provide superior holding power and work well with smaller workpieces. Mounting options include pressing in or gluing resistant to 175 f (80c).