Chicago Pneumatic 3/4 in drive CP7763D. This is a very nice light weight impact. Basic function test was performed, was hooked up to with a 1/4 air line ang it performed very well, please see video. Due to a misunderstanding with a pervious customer with a different impact, know this is a 3/4 drive impact and make sure you have a compressor big enough to run it. Any questions please ask. Please note 1/4 air hook up was installed for testing and is not included with impact.