Groz 61920 1/2" Pneumatic Impact Wrench - Aluminum Body Air Impact Gun for Auto Repair, Tire Change & Heavy Duty Mechanical Work

I had four mangled, deformed, rounded lug nuts on the truck. Three foot extension pipe on a breaker bar did not remove them. Just rounded the nuts more. Groz Professional 1/2 inch was able to remove the first easily. Could not remove the others. I beat on them for several minutes each with the gun. Nothing. Used 30 gallon, couple horsepower, Chinese Coleman compressor. Air output turned up to its max allowed. 20 foot 3/8" air hose. 1/4 inch inlet nozzle to the gun.I took the truck and gun over to another guy's shop for him to remove with his tools. I hooked my Groz gun up to his big compressor and 1/2 inch air hose. Groz removed the stuck rounded lug nuts easily. Key was the 1/2 inch air hose. The impact gun needs enough air to deliver that initial jolt on the nuts to break them loose. The 1/2 inch hose provided enough air in reserve to provide that initial jolt. Even using the same 1/4 inch inlet nozzle. Increasing the air hose size was key.I rate the Groz Professional 1/2 inch impact wrench a full five stars. It worked for me to remove stuck lug nuts. I have since bought a 1/2 inch air hose from Amazon to use exclusively with the Groz. I have no idea if the Groz produces the foot pounds output it claims in the description. Probably not even close. Longevity is not an issue either since I will only use it once a year probably. It was very cheap and it worked for me.Edit: Something has happened with the price on the Groz air impact wrench. The price shown is now a little more than 6 times more than what I paid six months ago.