Description 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. This item is a suitable alternative for the following: 562-101-00, 21009433