How often have you undone something with socket & ratchet and found the fixing too loose to get the ratchet to work?
These, hand friendly, adaptors make finger tightening or undoing far more comfortable and easier in spaces where there isn't room to get an extension on the socket.
They fit 1/2 in., 3/8in, and 1/4in square socket drives and have male and female ends so you can use them with an extension or ratchet.
They are sold with a plastic rail which keeps them together and can be bolted to your toolbox
I have found them really handy (no pun intended) from lasertools.co.uk for £18.50