Neodymium iron boron magnets, N52 grade is the largest energy products, BH max reach to 53MGOe. It's widely used in motor, sensor, clean up tool, sound device, aerospace, magnetic Separation and wind energy etc. N52 big block, the common size include 50x50x30mm, 50x50x25mm, 50x50x20mm, 50.8x50.8x12.7mm, 46x46x22mm, 45x45x20mm and 50.8x25.4x12.7mm.