8Pcs Carbide Burr Set 1/4 Shank w/Clear Box Max Head Dia 12mm Die Grinder Bits Rotary Tools Attachment Kit Rasp Accessories Metal Wood Stone Steel Grinding Deburring Cutting Porting Carving

Simply Stated: This product is of excellent quality. it's grinding abilities exceeded my expectations. I tested this product's capabilities by first attaching them to my heavy duty VEVOR Grinder. Wanted to see how this product handled grinding metal. It was "a piece of cake." So then I tried something a little 'unorthodox.' I attached this product to my "Porter Cable Drill Press" to see if they could be used to sharpen my various assortment of knives. Again, No Problem. Because of the way they handle metal, I have no doubt that they would do equally well on Wood, Polymer, Kydex, Nomex, Kevlar and other materials.

Very sharp, durable, worth the price

Works as advertised on mild steel. Quite impressive. Really makes some chips fly. Case is a little cheezy but does its job well enough.

Nice and awesome very easy to use and work it very good.

Great value.

I am installing an aluminum radiator in my Camaro and there is a radiator core support bracket that was over-stamped by about 1/8" and interfered with the mounting bracket. I bought these to trim off the excess. Initially, I tried using these in a cordless drill and they barely scratched the bracket. Once I chucked it into my RotoZip, they worked fantastic. In fact, they worked so well that I had to create a little shield to direct the shavings away from my face. I was working in a tight spot and couldn't change the angle to direct the shavings differently or switch the rotation direction. At any rate, these made short work of the task and I couldn't be happier about my purchase. I'll be using these to clean up some Chevy Big Block heads!

I used the larger cylinder-shaped bit to enlarge some holes with my Kobalt die grinder. It easily cut away the metal, and still looks new afterwards. Great bits at a great price.

Nice kit and carry case.