Can be difficult to hold the ring flat against the tool, but with enough effort it works well. The disk it came with seemed to be worn down after 2/4 rings. It got the job done, but I think I would suggest a better grinding disk if planning on using for more than just a 4cyl. Read more

I used the ring filler on my LS3 416 build. The manual filler did the job just fine. I was filling 1.2 mm stainless steel hardened nitrated top rings and 1.2 mm cast iron rings without any issues. I recommend this product. Read more

Very well built may be the only I buy in my ife time helped get rings gapped quickly with perfect flat ends will last for many many years Read more

Well I rebuilt my engine and sized all the piston rings according to spec using this little tool. It works fairly quickly you just have to pay attention to what you're doing and then make sure you of course de-burr the ring afterwards. There's probably other ways to do it but for the price this thing does the job well. It's not super high quality construction but it's good enough for the job. Read more

Cant beat the price for this very simple device that does its job VERY WELL! When building an engine it is extremely Crucial to have the proper piston ring gaps and ive always found that with a manual filer you can get a more precise grind with less chances of over grinding your rings and having to chuck them out A+ Read more