These Astro Pneumatic 3-in-1 metric hex keys are unlike any others I have seen before. They feature a ball hex tip on the long end, straight hex tip on the short end, and an innovative sliding 6pt socket, also on the short end.
When working with internal hex machine screws, you can slide the socket sleeve up and out of the way. When working with external hex fasteners or bolts, slide the socket down and voila, you have a socket wrench at the ready.
The hex key set comes with 5, 6, 7, 8, 9, and 10mm sizes, and is priced at $29-37
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The cleverness of the hex key drivers’ multi-functional design has me intrigued, although I’m not sure what types of users would really benefit from it.
Astro Pneumatic also makes a similarly designed combination L-driver tool set that fit Torx and external hex fasteners ($25-33 via Amazon), and a set of metric internal/external hex 1/4″ hex-shank bits ($17-23 via Amazon).