Trouble is, it's the wrong answer. If you read up it's NOT 1/4 drive. If it was I wouldn't have needed to ask lol



It's not 1/4 drive. I would estimate it as 3/8?
yep, they're a caliper pin ratchet and they also make a great bit ratchet. they take 5/16 hex bits.
Interesting. I kind of wish 5/16" bits were more prevalent.