Ratchets and sockets
Sockets, adapters and impact setters. Drive square and millimetre opening are two lines.What 1/4, 3/8 and 1/2 mean.
A ratchet and socket let you tighten a nut in a tight bay without lifting the tool after every stroke. You will find handles, extensions, universals and socket rails.
Start with the square drive, then the socket size in millimetres. Light assembly often uses 1/4; wheels and machinery more often 1/2.