VEVOR Drill Bits Sharpener, 3-20mm End Mill Grinder Sharpener, Lip Relief Angle & 95°-135° Point Angle Adjustable Drill Bit Re-Sharpener, Portable Sharpening Machine with 18 Collets, CBN & SDC Wheel

13A grinding the top angle and back angle of the drill bit. 13B grinding the top angle, center horizontal edge, and four different sizes of back angles together.

3-13 is ER20, and 14-20 is ER25.

sharpens both metric and fractional bits. eg., if you have a 1/2" bit - just find the collet that is a whisker larger and it will tighten down just fine. does a great job on bits a 1/4" and up. the really small bits will also sharpen, you just have to pay attention to your collet alignment.

This product is used to sharpen ordinary twist drills.

This Drill Bits Sharpener comes standard with a replacement grinding wheel. We currently do not offer individual grinding wheels for purchase.

They are, usually come up in a search for the drill sharpener. I've also seen them in a search for CBN or diamond grinding wheels. The problem is, they're typically not labeled as "drill sharpener" grinding wheels. The best news is that if you sharpen correctly, you should never have to replace them. If you're using this to sharpen drills commercially, e.g. a large machine shop or a sharpening service, you've bought the wrong machine. For a hobbyist or small machine shop, it's fantastic.