A socket set is a handle and a box of hollow heads that fit different nuts. Open the socket set.
It grips all six faces of a nut, so it will not round one off the way a spanner can. A socket set comes in metric and imperial, and using the wrong one ruins the nut.
1nounsocket setA handle and a box of hollow heads that fit different nuts.
“The socket set was missing the only size he needed.”
socket set is a tool.
Practised in Tools & DIY