Review on Efficiently Tackle Hard Metal Projects With Aiyun'S 6-Pack Metric Drill Tap Set For Steel And Aluminum by Jose Hughes

The 8Mx1.25 bit worked for me and got the job done. Best $12.99 I could have spent to drill and tap my damaged threads on the vehicle. I took my time (by hand) to slowly let the bit do its job. When the bit got snug, I worked the bit back and forth to loosen and shavings out of the way. After getting through, I backed out the bit without a problem. I chased the threads with a matching thread bolt and then then with the replacement automotive part.The thread tap portion of the bit had two spots where the bit chipped off. Both missing portions were on the trailing edge of the threads. You try to figure that out. I'm not sure but I would have expected the leading edge of the tap to take more pressure. My application was on a body part and not a engine. Any metal shavings were not going to be an issue. In my case, the chipped bit fragments were also not an issue.A great value for price but the user may want to know that the material seems brittle. A lot of other buyers have had issues with more catastrophic bit failures. Take your time and have a back but plan in case the bit fails. The Seller is also VERY QUICK TO RESPOND AND REPLACE THE DAMAGED BIT. I will upgrade my over all rating for this transaction but the durability rating will have to remain at 3 stars.