If you've ever started a nut or bolt using just a socket or your fingers, you know how useful these finger ratchets are. Essentially low-profile handle-less socket drives with a ratcheting mechanism, their round head lets you spin them rapidly when starting or removing a loose fastener.
The knurled edges provide excellent grip, even with oily fingers, so you can apply more torque to the fastener. You can easily get fasteners more than finger-tight, needing only a quick snug with a wrench for final tightening. The smooth-functioning 72-tooth ratchet changes between tightening and loosening with the flip of a switch.
Sold as a set of two: one 1/4" drive, the other 3/8" drive. An excellent complement to any ratchet set.