This Teng Tools ratcheting combination spanner combines an open ended spanner with a 72-tooth 12-point ring ratchet. The ratchet has a \'flip reverse\' feature, which switches the direction of the ratchet, and it is offset at a 13° angle for ease of access. Both ends are of the same size. The spanner is made from chrome vanadium steel for strength and durability, and has an attractive satin finish.The TEN600512R Ratchet Combination Spanner has the following specifications:Size: 12mm.Length: 172mm.