A kit to upgrade the gear box to the new GB2 in the Preciso and Virtuoso. If you have a Maestro, Maesto Plus or Barista Grinder follow the beginning of the GB2.0 Guide� to ensure this kit is compatible with the motor in your grinder. This rebuild kit for has all the parts you need to rebuild and upgrade the parts to the new GB 2.0 Gear Box. This new design eliminates the stripping of the gear. .Includes- new glass filled thermal plastic gear, drive shaft, motor mounting plate, and a couple of washer shims.