Sun Joe SB601RB Replacement Trimmer Blade, Compatible with SB600E, SB601E & SB602E Best Use: Replacement blade for Sun Joe SharperBlade SB600E, SB601E & SB602E Electric Trimmer/Edger Patented self-sharpening system Blade flexibility maximizes operator safety Slow wearing formula for superior longevity Maximized safety without pounding, restringing or refilling