For .139″ (3.5mm) Thick Blades .Bolt w/nut. Bolt 10mm X 23mm; 30mm round head; 10mm shoulder length; 15.9mm (5/8″) shoulder diameter; 10mm X 16mm nut w/washer. Use with 3.5mm thick blades.

Interchange 21009433,56210100, Net Weight (lbs) 0.12 Brand TISCO Make Type Model Kuhn Disc Mower 7301 Kuhn Disc Mower FC250 Kuhn Disc Mower FC300 Kuhn Disc Mower FC350 Kuhn Disc Mower FC4000 Kuhn Disc Mower FC44 Kuhn Disc Mower FC55 Kuhn Disc Mower GA300GT Kuhn Disc Mower GMD44 Kuhn Disc Mower GMD500 Kuhn Disc Mower GMD600 Kuhn Disc Mower GMD600HD Kuhn Disc Mower GMD77 Kuhn Disc Mower GMD800 Kuhn Disc Mower GMD902