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