Sonic Foam System - Deep Socket Set 3/8"- 23 Pieces - 1/3 (Small) air tools the coupler has an internal

the coupler has an internal stopper

I get that this is more expensive than brass or Chinese-made stainless

This contains the same carnauba found in their 476 paste wax

Inlet = 3/8" Male Plug for (Quick Disconnect) QD:  This 3/8" male plug inserts into a female QD coupler

Sonic Foam System - Deep Socket Set 3/8"- 23 Pieces - 1/3 (Small) air tools the coupler has an internalThese are the tools I've decided to use at OGHQ, they have a nice quality to them with good ergonomics. They aren't intended to replace everything but there is a great variety of tools offered here. For the price, you cannot beat them vs something that's 2x or 3x the cost like Snap On.