The Ultra Accel blade has two settings

giving a secure and positive connection when attaching pole extensions and accessories

it reduces fatigue for longer run-times and more efficient working

Inverter charger that enables quick charging in the filed by converting 12V DC from any lead-acid battery to 220V AC for your QC500

Husqvarna Sharpforce File Guide 2-in-1 Size:7/32" The Ultra Accel blade hasThe ultimate in 2 in 1 sharpening convenience filing both cutter and depth gauge at one time. User maintains excellent vision of chain during filing and file handle can be rotated for extended file life and reduced down time. 653 00 00 34 7 32" 653 00 00 35 3 16" 653 00 00 36 5 32"