Ratchet & socket sets contain different types of ratchets and attachments.
The mechanism of a ratchet allows you to loosen a screw without lifting off the tool during the process. Different attachments are available for different screw sizes. They are called „nuts”and are plugged on the ratchet. Another big advantage is the resulting variety of applications. For the use of the ratchet, free space above the screw is needed to place the ratchet including the nut on the bolt.
A ratchet & socket set is the combination of a ratchet with various nuts, attachments and extensions. The variation possibilities are manifold. Popular drive sizes of ratchets are 1/4 ", 3/8", 1/2 ", 3/4" and 1“. Different attachments like torx nuts and many other forms such as different handles like plug handles, angle handles and many more are available.
Snap-on provides all sets in the usual high quality, in different sizes and varieties.