I bought a few of these with the “tougher” bits during the Kickstarter campaign. I and the gift recipients of them really like
this product. The wheel/disk is useful. It’s really for lighter work but I’ve used on some larger rusted bolts and generated enough torque with the wheel to snap the heads off. I have about an 80% hit rate for good products purchased via Kickstarter or Indiegogo. I consider this to have been an excellent purchase.