Uxcell 1/2" Drive by 21mm 6-Point Impact Socket, CR-V Steel 1.54" Length, Shallow Metric Sizes

Uxcell 1/2" Drive by 21mm 6-Point Impact Socket, CR-V Steel 1.54" Length, Shallow Metric Sizes

Made of chrome vanadium steel for strength and durability.
With black phosphate finish, prevents rust and corrosion.
Has a 6-point opening, it can fit tightly to the hexagon of the fastener head so that the maximum torque can be applied without slipping.
To prevent round-off under stress, it grips the flat sides of the fastener head rather than the corners.
The through-hole in the drive end locks onto the tang of impact wrenches or drivers so it won't fall off or stick on fastener heads.
Widely used in DIY hand-making, household maintenance, and most general repairs.