... Option materials: SmCo, NdFeB, etc. SmCo Micro Block MagnetFeatures: 1, Micro block magnet, which is made with watch stone tooling technique ... SmCo, NdFeB, Ferrite, AlNiCo, artificial jewelry, crystal, ceramic and other super hard materials is available for machining. 3,Tolerance within ±0 ... .005mm to ±0.02mm. Specification of micro block rare earth magnet:ItemLength (mm)Width (mm)Height (mm) ...