The Britool E117377B Ratchet combination spanners have a 5° ratcheting head and a 12-point OGV® ring end, which is angled at 15° from the handle axis (increment angle 30°). The OGV® Ring profile maximises contact surface with the nut for a longer lifetime.The switch to change ratcheting direction built into the handle prevents accidental change.Forged from chrome vanadium steel with a high chrome finish. ISO 691 - ISO 1711-1.The Britool BRIE117370B Ratcheting Spanner 21mm has the following dimensions:Size: 21mmLength: 285mmWeight: 540g