Cylinder magnet is made of rare earth neodymium, thespecific size is 3mm diameter and 20mm thickness, so it also called 3mm dia rod neodymium magnets. The specification of cylinder magnet can be customize according to your requirment. This rod magnet has a strong power and can embedded in some object. It is widely used in eletrical watch, toy, door or window latch, education equipment, precision instrument, magnetic lock and so on.
The sample display of 20mm thick neodymium rod magnets 3 x 20mm:
Other size cylinder neodymium magnet:
N38 3mm diameter small rod neodymium magnet D3x5mm (1/8"x 3/16")