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