This set includes all sub componets need for the Gearbox-1 including 2 carbon fiber rods, 12 M4 Square nuts, 12 M4 Cone point set screws, 1 side mount retaining ring and 3D metal printed Bit 3/8" size.
The end cap and gears are not included, these are downloadable as 3MF files for local 3D printing.