I gave this 5 stars ONLY to keep them from erasing the review. They claim that this fits a bridgeport mill. Yes it will but you have to modify it to fit. It is not a direct replacement. The key way in the drive gear is poorly machined , Shim pac was missing, and the instruction un readable. The bracket that mounts to machine had to be modified as well The ONLY WAY i got mine to work was to rob parts from other machine to get it to work. After I got it to work the motor was LOUD and runs ruff .If you contact the seller he will ask for pictures. This is a stall tactic. He uses it on other web sites too!!. I am a season machinist and I can tell you, this is JUNK . GOOD LUCK WITH COSTUMER SERVICE TOO ! Cause as soon as he gets you money the warrant ENDS.