The head is twice as thick as most ratchets. Not for use in tight spots, but it has a ring to speed the socket. Unknown tooth count. https://i.ebayimg.com/images/g/ETEAAOSwkHNfStuR/s-l1600.jpg
Having a 19mm is nice but no 12mm makes this set nearly useless. They should have ditched the 11mm for a 12mm.