Built with a hollow upper arm and wrist, the M-20iA keeps dress-out packages safely tucked away. No danger of wire harnesses and other utility cabling interfering with equipment or other parts -- the through-arm routing protects the cabling.
The M20iA has a tidy solution for peripheral attachments as well. The upper arm has a shelf area where "extras" can be stored, leading to simplified wiring and fewer considerations when programming. The FANUC M20iA can use the R30iA or R30iB controller.