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

I use these mostly to make an indent for drilling. They work well for that. Ive used them on Aluminum and steel. I recommend clicking them several times to make a good indent so the drill bit stay where it should when starting to drill. You can also use these to break a car window in case you are trapped inside or you need to rescue someone. The parts are all metal and seem to be machined accurate enough to work well. Ive used similar punches that cost many times as much as these and they work pretty much the same.

These are like other import automatic center punches Ive used. Fits nicely in the hand. The punch is a bit wobbly in the handle, but it gets the job done. Its made of carbon steel, not SS. There is no real spring tension adjustment, it just screws apart and back together. Not sure what youd need to adjust the tension for, anyway. Two of these cost less than the sales tax on the premo US made one these are made to look like. No comparison, of course, but I used one of them to make multiple dimples in a sheet metal plenum for the center pivot of a compass so I could mark take-off holes. It did the job just fine.

Love it

The mechanism in both United are very difficult to work. Need to repeatedly press the unit down more than once to have the spring disengage and spring back to make the mark. Is is easier to just use a scribe instead of the center points that I purchased. Not happy with the product unfortunately. Thank you.

Given the low pricing of these punches, I didnt know what to expect. I was very pleasantly surprised when I opened the package. The finish appears to be top-notch and the punch performed nicely on some mild steel I had laying around. I dont expect these punches to last a lifetime but it wouldnt surprise me if they did.

Cant beat the price, good quality

The tool is inconsistent. I rarely works as intended.

The karmiero is decent and definitely more than expected for the price of $4.99 especially since it comes with two. It has worked well for my use so far but probably not made for daily shop use. This spring loaded center hole punch design uses adjustable Spring Tension screw, you only need to rotate the cover to get the suitable impact strength to leave an indentation on your surface. So far Ive used on wood and metal with. no problem.

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

After 1-2 week of use.