2Pcs Heavy Duty Automatic Center Punch, 5 Premium Steel Spring Loaded Center Hole Punch, Adjustable Spring Impact Center Marker Scriber Tool for Metel, Plastics, Wood, Glass by karmiero

After 1-2 week of use.

If you have to drill holes in ...... you can simply start drilling and hope the drill bit actually goes in straight. On metal or on rounded surface you know the drill bit will dance around before catching and scraping up the surface as it goes. These center punches are spring loaded so you simply place it where you want to drill press and it leaves an indent keeping your drill bit centered and straight. A must have for anyone working on metal or plastics. Good quality tool which when you learn how to use you wont ever not want to be without.

I like how good they worked

Made a small prick in both aluminum and hard steel. Although I thought it worked fine I believe a slightly stronger spring would improve it. I used it full tension but would liked slightly more resistance for a little deeper hole.

karmiero 2 Pc Automatic Center Punch Remarkably, both of the spring-loaded automatic punches worked the first time. The grip is easy to maintain. First, I tried various types of wood. The pressure to activate the punch is minimal. Each time it scribed a hole mark. I then went to metals such as aluminum and steel. The steel required spring adjustment to get a good visible hole. The punch never slipped and was accurate. The tools are easy to assemble and disassemble. Well manufactured, and no detectable flaws. Excellent value.

One didnt work at all and the other works kind of, but only 1 out of 2 times.

It malfunctioned on 3rd use, not sure how long it will last.

Cant beat the price, good quality

Easily adjustable striker. Works perfectly. Built well.

I like how good they worked