I just got the gearwrench 3/8 pinless swivels and can confirm, they are made in usa (box said so). To the op's question, I love the sk4080 set of 3/8 semi deep impacts. Far and away, these are my most used sockets..2nd being the 3/8 swivel. I have pinned swivels but have found that I use them so frequently, I wanted the nice pinless type. I'll probably move the pinned set into the race trailer. Other than lug nuts, the 3/8 semi deeps and swivels cover 75% of my socket usage I'd guess. I occasionally reach for deeps but I almost NEVER use shallows. Maybe it's just me, but the shallows are just rarely needed and the semis give me more knuckle clearance. I do also have a set of nepros 3/8 semi deep chromes that I absolutely love. Great fastener fit and amazing finish. I almost avoid using them they are so nice..almost 
ahm
ahm