ALLY Tools Super Strong 6 Inch and 5 Inch Heavy Duty Automatic Center Punch, Perfect Automatic Center Punch for Metal, Wood, Plastic, Glass, and Marble – Features Spring Loaded Center Punch Design

These center punches were purchased for use around the home. I do not know how they would perform for commercial use but the price and function are satisfactory for me.

These look and feel a little rough, but theyll do the job. Out of curiosity, I took apart an old Starrett punch and found the springs to be interchangeable with the smaller punch in this set - so if youve got a similar old center punch with tired springs, this will rejuvenate it, and you get an extra larger punch to boot. Nothing wrong with these as they are though, especially for the price paid. I havent used them on an actual project yet, but they hit hard for sure, I expect them to work great for centering drill bits in metal. I havent tried breaking glass, but cranked down all the way I bet they would.

just what i needed

Nice punch with a strong spring and accurate centering