RH Brush Mower Blade

This milled knife is used to clear shrubs, small saplings, grass, weeds, and other brush. The milled edge is for clean cutting and lasts just as long as a "smashed" edge. It is made from durable 5160 steel. Uplift design for easier cutting and less rocks.

How do you know when to replace this knife? When the outside edge starts to get a curve or worn down or when machine becomes out of balance.