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The channel has a large diameter of 0.8x1.1nm, and is non-selective for small ions. However, it has an upper exclusion size limit corresponding to molecular weights of about 600 Dalton of permeants. Because most metabolites have molecular weights lower than 600 Da and have been shown to pass through porin channels, porins are called general diffusion pores.
They are about 12 Âµm in diameter in blood smear preparations (about twice the size of red blood cells). (Example at WebPath; electron micrograph at WebPath. Too many neutrophils is called neutrophilia; see example from WebPath.