What can these bits work on

This is a driver set. It includes a handle (the green item), several bits (lower left) and several sockets (upper left). The long items in the lower middle is an extender. One of the items in the bit tray is an adapter to allow the handle to accomodate the sockets.

The bits make it a multi purpose screwdriver. The sockets make it a nut driver.

I think the bits as basically very low quality. When you go to your favorite store, simply buy one of the contractor grade of bits like DeWalt, Kolbalt, Irwin, Vermont American etc. Be careful what kind of jobs you tackle with your light duty screwdriver. I'm sure it does not have the power to drive longer screws into hard woods like decking etc. You have to hold a lot of force against the screw in these situations or the bit will slip, spin and dull, as well as strip out the screw head.