Up for 'buy it now' is a Ridgid Style 3RSB Heavy Duty well made Rotary Saw Blade Set. Designed for cutting roots and plowing through heavy debris. For use with cable No's, C10, C44, C45, & C46.  Fits K1500, K50 K60 or anything running a Ridgid 7/8" Cable End. You won't find a better root bit period!