Jack Hammer
Contributor
Most BPs are roughly a 'one size fits all' 'standard' size. There are longer ones for taller folk and smaller ones for shorter folk. There is some variety among the 'standard' sizes plates, like overall shape, depth of channel, angle of bends, number of mounting holes, number of slots, etc. I have plates from 5 different manufacturers and functionally I honestly can't tell any difference between them when in use other than needing more or less weighting due to the type of material it's made from.