The BP had a measurement of 0 which you let me know about. I asked Herzo to correct because it was their BP.
Each model pattern might be different from the BP as it is in this case of the ARWPF15384. The tech pack for the ARWPF15384 calls for .8cm, so you can leave it at this measurement of .8 cm.
Thanks for asking, we would have been confused as to why it changed.