What means of af spanner?

A spanner is a hand tool used for gripping, fastening, turning, tightening, or loosening various nuts and bolts. It typically features a U-shaped or open-ended design, or a closed loop called a socket, allowing it to fit different sizes of fasteners. Spanners come in various types, including adjustable, combination, and torque spanners, each serving specific purposes in mechanical and construction tasks.