4B finish, it is a mill finish, which is not available with us and not common seem in the market, but you probably know No.4 finish and #4 fnish, but this is a processed surface finish by abbrasives.

No.4 is a finish mostly accepted by the whole world stainless steel users,  it is not a directonal brushed short hairline with surface protective film laminated over the processed surface, prevent it from scratches and possible damages during transition and fabrication.