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 BRIE113293B Open end spanner has the following dimensions:
Size: 5/8 x 11/16 AF
Length: 204mm
Weight: 125g
Height: 6.10mm