Set of torque extension adaptors (crow's foot ring spanners) for use in restricted access applications, extending the reach of the torque wrench by a defined length. 3/8"D x Bi-Hex (12pt) profile; length range: 65 - 70mm.Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm. Torque setting must be adjusted to allow for the effective increase in leverage length. Manufactured from polished chrome vanadium.