The hydraulic punch knockout set is made strong, the cutters are nice and sharp and easy to put together. However, the hydraulic punch did not come with the additional extra O-rings as advertised. They were missing, also a metal gasket as illustrated in the manual. The dust cap covers were missing as well. I did fine and refilled the oil port to add oil to the hydraulic cylinder.
I will buy it again if needed to, it works as intended. I recommend it to anyone who is looking to punch nice clean holes in the project. Better than a hole saw for clean hole.