That 1/4 drive SK set was the preferred weapon of choice when I first began my aviation aircraft rebuilding career. The set I have is actually a combo set with shallow and deeps, two extensions, a swivel, nut driver, and the ratchet.
That ratchet is ultra fine tooth like a fine watch and worked damned well if you only had 1/2" to swing the **** of the ratchet with your hand jammed in a lightning hole to tighten up bolts. I still have my set and would never sell it!!!!