I don't usually write reviews until I've used a product for a while, but I was able to skip a bite of dill right away. In the past most "cheap" drill bits have failed me, either by quickly dulling and thus hardening the metal where I was trying to drill. or breaks/bends under heavy pressure. Most others don't drill consistently round holes or "run" off center when they start drilling. A few years ago I completely gave up cheap imports. The disappointment just wasn't worth the upfront savings. But with skyrocketing inflation and my budget cuts, I felt like I had to take a risk. Here's what I did. With my 3/4 hp. As a drill set for maximum torque and lowest RPM, I took a 1/4" drill bit and drilled 61 existing holes in 3/4" mild steel. I then took the same drill bit and drilled 21 more holes in 1/2 inch diameter mild steel. Finally I drilled 22 more holes in the 1/8" channel. I used oil and didn't push the beats any harder than if my name had been slapped. Results. The bit was originally slightly smaller compared to my big brand everyday bits , but it cut round holes perfectly. After my test project, the drill bit cut a little smoother and still left a clean, round hole. I was impressed but reluctant. I only tested one bit out of 230. Statistically, maybe I was just lucky .so time will tell.at the moment I've refilled my 135 degrees.bits from this set for everyday use and I haven't had any problems yet.if I do I guess I'll post an update.