Set of 20 magnets Size completed ring: 54mm OD x 46mm ID x 20mm Long Material: Neodymium (NdFeB). Grade: N48 Coating: Nickel (Ni) SKU# MMOT544620 OD = Outer Diameter ID = Inner Diameter N48 equals very strong magnetic material that will produce their maximum strength up to 176 degrees F. Beyond 176, N48's begin to lose strength. ASSEMBLY REQUIRED: These magnets will be sent as 18 arc segments - 9 with N Poles on the outer diameter and 9 with N Poles on the inner diameter. PLEASE NOTE: As with ALL neodymium magnets, these arc segments are very fragile. Therefore, 2 extra arc segments will be included with each lot purchased - one of each polarity. *** Please be careful when assembling.***
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