1" Dia x 1/2" ID x 1/4" Thick Ring

1" Dia x 1/2" ID x 1/4" Thick,
(1/2" hole) NdFeB Ring Magnet, highest grade available, Ni-Cu-Ni Plated
with Matte finish,
Axially Magnetized (the top & bottom flat faces are the
north & south poles). Inner Diameter is 1/2". Theoretical maximum pull: 23 pounds.