Socket wrench
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A socket wrench is a type of spanner that uses a closed socket format, rather than a typical open wrench/spanner to turn a fastener, typically in the form of a nut or bolt.
Socket set with ratchet (above), four hex sockets and a universal joint
Torx socket
"6 point" hexagonal socket
Splined socket
Ratchet (device)
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A ratchet is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools
Socket wrench
…form of a nut or bolt. The most prevalent form is the ratcheting socket wrench, often informally called a ratchet. A ratchet incorporates a reversible ratcheting mechanism which allows the user to pivot the tool back and forth to turn its socket instead of removing and repositioning a wrench to do so. Other common methods…
A ratchet lever hoist, also known as a 'come-along.'
Cutaway of the ratchet mechanism of a cable tie.