Count the number of tynes and multiply by the spacing

E.g. for drills with 121mm spacing
23tynes x 121mm = 2783mm
29tynes x 121mm = 3508mm
49tynes x 121mm = 5929mm

E.g. for drills with 150mm spacing
23tynes x 150mm = 3450mm
29tynes x 150mm = 4350mm

E.g. Power harrow or Roller

The full working width of the implement in mm.