The history of the new Pz series plough family produced by Unia-Grudziadz begins in the second half of the 1960s. Fully welded frames made from thin-walled rectangular profiles were used for the first time. Emphasis was also placed on the unification of parts between different models. The ploughs are designed to work with low-power tractors (25–50 HP).
The package includes:

U021 (Pz-230) "Eagle":
- number of furrows: 2
- working width per body: 30 cm
- working width: 0.6 m
- power requirement: 25 HP
- weight: 230 kg
- price: 680 $
- production year configuration
- additional equipment configurations
- color configurations
- visual element configurations

U022 (Pz-230p) "Woodpecker":
- number of furrows: 2
- number of subsoilers: 2
- working width per body: 30 cm
- working width: 0.6 m
- power requirement: 35 HP
- weight: 270 kg
- price: 840 $
- production year configuration
- additional equipment configurations
- color configurations
- visual element configurations

U023 (Pz-330) "Vulture":
- number of furrows: 3
- working width per body: 30 cm
- working width: 0.9 m
- power requirement: 40 HP
- weight: 320 kg
- price: 920 $
- production year configuration
- additional equipment configurations
- color configurations
- visual element configurations