Grace TrueCut Rotary Blade Sharpener sharpens any brand of rotary blade from 28mm to 45mm in diameter. Sharpens your blade without having to remove it from the cutter. Long lasting, high quality sharpening stone. Hands-off use! Non-slip feet keep the sharpener from moving while in use. Sharp blades require less pressure to cut, giving you more accuracy and less chance of slipping. The TrueCut Rotary Blade Sharpener sharpens your blade with the same motion you use when cutting fabric.