3/8 VDE Socket

Chrome Vanadium Steel (Cr-V) is one of materials used for making sockets.
It has its own advantages. Cost-Effectiveness: Cr-V is cheaper than Cr-Mo, making it a popular budget-friendly option.
Hardness: Cr-V is harder than Cr-Mo, which means it resists wear well.

The size of the drive socket (the part that attaches to the socket wrench). These are always given in imperial measurements, and will usually be either 1/4", 3/8", 1/2", 3/4" or 1".

The size of the socket head (the part that fits over or into a fastener). Usually, the smaller the drive socket size is, the smaller the socket head size will be, and vice versa.

The majority of socket sets can broadly be categorise into either small-size or large-size sockets, with some overlap at the upper and lower ends of their sizing ranges.

Small socket sets - usually have 1/4" or 3/8" drive sockets, and head sizes range anywhere from 3mm to 22mm. These are ideal for use in confined spaces, or where a small gauge of fastener needs to be adjusted or removed.

Large socket sets - commonly have 3/4" or 1" drive sockets with head sizes ranging from 19mm to 50mm.. Large socket sets are generally required for larger fasteners, which tend to require (and withstand) more torque when tightening or loosening. A larger socket size usually indicates a larger drive socket, which can help deliver these higher forces without risking immediate damage to the tool.

Half inch socket sets - half-inch socket sets effectively occupy the middle ground between what would be classed as 'small' or 'large' sockets. The 1/2" drive socket standard falls right in the middle of the standard drive socket sizing range, and socket head openings intended for use at this gauge range anywhere from 8mm to 32mm in metric measurements.