Kincrome 12 in 3 Double Ring Gear Spanner set. The Kincrome 4 in 1 Double Ring Spanner set offers four different sizes on a single spanner, making it one of the most versatile spanners available. With a 0 degree offset, each end has a reverse switch making easy use of each size. Works with just 5 degree sweep.Size range; Spanner 1: 8, 9, 10, 11mm, Spanner 2: 12, 13, 14, 15mm, Spanner 3: 16, 17, 18, 19mm.