The Britool open-end spanners (imperial) are forged in chrome vanadium steel with a high chrome finish. The open end is angled at 15° from the handle axis.

ASME B 107-100.

The Britool BRIE113292B Open end spanner has the following dimensions:
Size: 1/2 x 9/16 AF
Length: 180mm
Weight: 105g
Height: 5.10mm