Oregon brush knives.
We supply 2 variations of brush knife with 2 different bore sizes
559023 = 3 teeth, 255mm (10") x 3mm thick, bore size 20mm
559024 = 3 teeth, 255mm (10") x 3mm thick, bore size 25.4mm
559029 = 3 teeth 300mm (12") x 4mm thick. bore size 20mm
559030 = 3 teeth 300mm (12") x 4mm thick. bore size 25.4mm