A mower blade includes a mid-section, two sharpened, end sections, and a blade longitudinal axis. The mid-section includes a circular, central hole having a relatively large diameter and being centered on the blade longitudinal axis and first and second slots centered on the blade longitudinal axis. Each of the first and second slots are positioned on opposite sides of the central hole. The mid-section also includes first and second circular, side holes positioned off the blade longitudinal axis and on opposite sides of the central hole. Each of the first and second side holes have a diameter that is smaller than the diameter of the central hole. The diameter of the central hole is larger than the width of each of the first and second slots.

 
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