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The socket size you need depends on the bolt or nut you're working with—metric sizes (e.g., 10mm) or imperial sizes (e.g., 3/8”) are most common in the UK.
A socket set is used to tighten or loosen nuts and bolts efficiently, often with a ratchet handle for ease and speed.
The difference lies in the size of the drive fitting: 1/4" is for precision work, 3/8" is ideal for general use, and 1/2" is best for heavy-duty tasks.