Replacement blade mounting kit for King Kutter RFM Series  Finish Mower. This listing is for three (3) 1/2" X 1-1/2" Left Hand Thread Bolts with Concave Blade Mounting washers, a full set for your mower 
Specifications:
1/2" Diameter X 1-1/2" Long
Left Hand Thread
1/2" Concave Spring Washers that are 1.50" in diameter