Review on Enhance Your Stained Glass Mosaics with Aanraku Glass Grinding Bit Twofers -12 Pack 3/4 Inch - Premium Stained Glass Mosaic Supplies by Carrie Spencer

These sharpening attachments really didn't work for me. They made a piece of glass around the edge. I thought it might be user error so I tried sharpening on another machine with new sharpening attachments from another company and they worked fine so it's not me it's the bits. Too bad because the price is right. But you get what you pay for.