I had to make some round holes in some 0.090" 5052 (to mount guitar pickups) and they were 2 very odd sizes, so figured I needed an indexable boring head to do so. When I searched almost all of the hits were some obviously Chinese junk for just over $100 Cdn from Amazon. I know they actually have machine tools in China, so for the price I thought I would give at a shot. Holy crap what a mistake that was. The brazed carbide inserts are not on the tool centerline, they are about 1/8" above. To make matters worse, they are round mounts to fit in socket of head, so nothing to hold in correct plane when mounting bars in head. Only way to make them work is to grind the crap out of the brazed carbides....and since I needed to make the holes, I did so ending return-to-seller option. In the end I piloted the holes and used tapered reamers.