These Faithfull Chrome Vanadium spanners have flexible ratchet heads, which can turn through 180, allowing them to be used in more awkward to reach places at any angle. Each spanner has a 72 fine-tooth mechanism. A useful arrow illustration is etched in the spanner to indicate the direction of torque.180 head for access into tight places.5 Fine Ratchet Mechanism. This set comprises the following sizes: 8mm, 10mm, 13mm, 15mm, 17mm and 19mm. Faithfull Ratchet Combination Spanner Flex Head Set, 6 Piece in Silver