TEMCo TH0037 4" Hydraulic Knockout Punch Electrical Conduit Hole Cutter Set KO Tool Kit 5 Year Warranty

Before I purchased this product, I read all the reviews, and reached out to TEMCo directly, with my concerns, before making my purchase.TEMCo was quick to respond and address any concerns I had; i.e. draw stud construction, case sturdiness, seal leaks... There were no excuses given. Just assurances the issues had been corrected.Satisfied with their responses, I purchased this set. What I received exceeded my expectations. I have used Greenlee knockouts in the past, and this unit is right on par, with quality. The case is designed well and very sturdy. The hydraulic unit, hose and ram are very sturdy. The draw studs and cutters are substantial as well.I have used the 3.5" knockout on 14ga galvanized steel. After 8 holes, the knockout is producing holes as clean as the first one.This is a High Quality tool, at a Great Price!!

Ok after 6 years I'm finally leaving a review, this knockout set is made of good quality, I've had to punch 4" holes in 1/8 metal junction boxes and where the name brand knockout sets Green and Mille. Couldn't do it Temco came through, I'm happy to have purchased this 6 years ago, the price has gone up and it is justified through the quality, the only it's not built for is not smart people to be nice but has survived a few of them.

First of all, I’d like to say I absolutely love a knockout set. We use it weekly on a professional basis and I’m going to buy two more. It works better than our name brand KO punches and all of the dyes and thread are universal with name brand manufacturers. The latches on the case broke due to improper loading in our truck reached out to the company immediately got back to us and sent us replacements. They’re awesome.

Tool itself seems ok, however on my first hole (4”) the draw bar broke. First it bent then broke on the second hole... no big deal they have a 5 year warranty right. Apparently not. I contacted the company without even a reply. Warranty is a lie. After only a month they forgot about me, a customer with the ability to write a review. Bad move. Tool is now useless.Update: after some back and forth with Temco i received a replacement draw stud. Only after i sent them a picture of the hole i punched when it broke, described the metal i was punching out and also explained my experience using these types off tools. I also had to contact amazon directly since i wasn't getting a response from them. In the end they stood behind their product, seems like they were more concerned about my review then my satisfaction with the tool. the draw bar was delivered extremely quickly and the tool is back in working order. I do believe that it might have been a defective part that broke in the first place, the tool seems to be a well made quality tool. My original review was one star but since they made things right i give it 4 starts for good quality at a great value. I would purchase more of their products for sure.

If you are working in the marine field and dealing with a lot of NEMA 4X and NEMA 12 enclosures...this thing is the best money you will spend all year. It has greatly increased the productivity and proffesional appearance of the holes in these enclosures. SO MUCH BETTER than a hole saw, and way more economical than a battery powered set. It is very fast, the plug buster has broken every single plug thus far, making material removal super easy. The only down side to this unit is the weight of the power head... if you have to work overhead, you better eat your Wheaties cause this thing will wear you out if you have 14 holes to poke. Other than that, I love this tool.

I had a job where I had 7 stainless steel cabinets that I had to cut 3" and 2" holes in each one. It was in a casino that was open for business so using a hole saw would be very loud and messy. I decided to buy this knockout set so that I only had to drill a small hole to get the 1/2" post through. On my very first attempt I "guessed" at the location to start my first hole. Once I used the 1/2" ko to make a hole that the 3" could use I set it up with out looking at "exactly" where I was cutting. Half way through I realized that at the bottom of the cabinet there was a lip that caused it to be two layers of s.s. causing my KO to lock up, couldn't get it through and couldn't get it to release. My 3" was destroyed. Thank God I had a 3 1/2" in the kit and did the rest of the job.I contacted TEMCo and explained what I did wrong and asked if I could just buy the parts I ruined. I had amazing customer service and they ended up sending me a replacement 3" KO!!! What an awesome company to warranty a product that I ruined because of lack of preparation. My kit is whole again and I use this where ever I can, best purchase of the year!!!

Purchased in anticipation of needing to punch out many various conduit penetrations in the field to thick, mild-steel weather-rated enclosures - ranging from 4-inches to 1/2-inch. While we have Greenlee manual sets, the thought of wrestling with, holding and torquing out many close-spaced holes was concerning. The hard part was measuring and marking. The Temco unit quickly provided that welcome 1st click, 2nd click, 3rd click and 4th click feedback indicating progress and release and with just a few effortless pumps. Good buy and the product seems well made and the packaging decent.

Overall for the price this is an okay set of knock out punches. The problem that I had was with the 3'' set the cutter head is apparently sharper on one side than the other and it pulls through the cup at an angle which made the draw bolt deflect and draw through the cup at an angle. It got the job done but barely. It works much better on the smaller sizes and I haven't tried the 4'' knock out yet.