I have the 3/8 drive 8-22mm impact swivel set. They're nothing special. They are NOT the pinless type. They are pinned with a collar although the collar isn't as thick as the ones found on Grey Pneumatic or Sunex versions. They are supposed to be dual marked with gold and stamped size markings but, my set only has the gold size markings.
Although a lot more money, the Craftsman, Armstrong Maxx, or Matco pinless sets are vastly superior.The pinless design give you a lower profile and improves access by not having that fat collar. The pinless design is more like a CV joint and rotates smoother under load.
I would watch for a sale at sears or pick up a used matco set off ebay, just make sure they are they pinless design.
The is an Ebay seller that has most of the Gearwrench impact socket sets listed.
