Screwed right on to my air hammer. Love not having to mess with that retaining spring. Did need a little oil to work smoothly. Some of my cheaper chisels needed some fiddling to work right. But that I think is the chisels not the retainer. I would use a little loctite on the retaining screws helps them stay tight. All in all great upgrade I like it.

Good quality, well made and easy of use. Make my job easier switching air chisels back and forth on different job. This quick change retainer for air hammer chisel gun is a must have if you do lots of work with your air hammer. Very nice to have around.

Adapter is all metal except a plastic threaded insert that attaches to the air hammer, time will tell how long it will last. The quick change concept is good especially for broad head chisels, unfortunate that they skimped on the threads. Maybe it will last a long time with hobby type use.....

I have an older campbell hausfeld air hammer I've used for years. I've fought with the old style spring retainer to change the bits, caught the spring numerous times in various tight areas working on cars, and broke those spring retainers. I wish I would have found this quick bit change adapter years ago. It is a significant improvement over the old spring style retainers. If you're contemplating on whether or not to use this, buy it. It does thread on a little rough but I was able to get it secured to the air hammer with no issue with operation.

LE LEMATEC Quick Change Retainer / Chuck for Air Hammers - Locks Bits On & Works Great! Fits IR!LE LEMATEC's quick change retainer replaces the traditional spring retainer entirely. It screws onto the end of your gun where the spring retainer used to sit and locks into place with three allen screws. The retainer itself locks the bit into place with three large ball bearings in much the same way your air tools connect to your air hose. I have this setup on my IR 121 now and love it. The traditional spring retainer is now a backup. This will not allow bits to exit your air hammer without you expressly releasing it from the chuck. No bits will go “flying” again. In my years of experience, many shops did not allow inexperienced technicians to use air hammers at all because of how easy it is to let bits “fly” doing damage and put themselves and others at risk of severe injury up to death. This quick change chuck retains your bits until YOU release them.I used a basic, old school, belt wrench to grip the body of the quick change retainer to install it on my IR-121 air hammer. I backed out the allen screws to just the collar insert so it would not mar my air hammer. It twisted on firmly. When the chuck was seated fully, I tightened the allen screws. Mine required a 3mm allen wrench.Bottom Line: 5 StarsLE LEMATEC's quick change retainer is a more than suitable replacement for an IR-121 air hammer's spring retainer. I cannot definitively speak to any other make or model tool's specific fitment; however, I suspect the size is standardized among manufacturers. I have used this a few times and even had a bit's shaft “mushroom” inside my gun. This required removal of the chuck to pry the bad air hammer bit out. So, this quick change retainer / chuck is removable and reinstallable. I can HIGHLY recommend it to you!