Brand: Beta Tools
The 900 Series 6-point metric sockets from Beta Tools fit any standard 1/4" square drive ratchet handle or driver.  The polished finish looks great and wipes down for easy clean-up.  
This socket fits any fastener with a 5mm hex. The socket measures 8mm OD at the hex end (Ø), 11.8mm OD at the square drive end (Ø1), and 25mm long (L) with a 9mm deep hex. Weighs 9g.  Sold individually. 
Note: These sockets are for use with hand drivers only! They are not for use with impact drivers.  Using hand sockets with impact drivers will void their lifetime warranty.