The Dual Rotary Blade Sharpener is a wonderful little tool that extends the life of rotary cutting blades.

Simply hold the sharpening disk in one hand, position the blade directly onto abrasive ring and twist in one direction to remove small burrs and dull spots from the blade
Repeat on the other side of the blade for a fully restored blade
Full instructions included with the product

Available in three blade sizes:

28mm
45mm
60mm