30PC 3.5KG Mini Neodymium Magnet Base D12mm Thread M3 led Panel Precision Machine Magnetic Mounting Base

1.Silver Color 2.30pcs as a lot. 3.Each with M3 thread(9mm length) . 4. Made of N42 neodymium magnet and steel shell, the magnet is putted into one steel shell which concentrates the magnetic force on one side of magnet and increase the attracting force of magnet incredibly (2.5-4 times for same size of magnet) . Meanwhile, the steel shell protect the neodymium magnet against chipping and cracking. 5.Mainly used for precision machines , Led panel, mini signal led lighting etc.