US Pro 10pc 1/2 Drive Deep Impact Socket Set.
 
Sizes 6 point surface drive: 10, 11, 13, 14, 17, 18, 19, 21, 22 & 24mm.

Made out of Chrome vanadium steel with an electro deposition manganese Phosphate finish for added corrosion resistance.

Suitable for use with impact type air wrenches.