Review on High-Performance Powercoil 3520-8.00K M8-1.25 Thread Repair Kit - 1 Kit per Pack by John Hall

I've been using heli coils for decades. I bought it to fix a hole with no likely expectation of using it again. Anyone capable of repairing damaged threads has likely encountered minor drill and thread chipping that can break in the hole. You have to understand that excellent drills are outrageously expensive. Box drills only serve to make a hole or two in anything other than wood, regardless of the nice finish. Right out of the box the 1/2" bit broke even after I drilled the holes. That's where it went in the trash. Luckily the chisel failed before it reached any depth. I was able to pick it out. The tap is for applications designed to be light duty and the replaceable threads are for light duty applications I repaired a hole in an antique almost irreplaceable water pump on my 1985 Mack truck which is cast iron I am disgusted with the ROC and the American corporations which have gone abroad. They cannot be replaced by higher instruments. A good drill costs as much as the whole kit. Negative stars would be appropriate.