neodymium magnet 20mm x 10mm x 1.5mm nickle coat

1 10mm 20mm 5mm 631010 631010b2010015nk b2010015 b2010015nk bolt chrome closeup coat cylinder design earth element equipment factory field force hardware industrial industry iron macro magnet magnetic magnetism magnets material metal metallic nanotechnology neodymium nickel nickle object plated powerful rare science segment silver steel strong technology tool