This 10-piece double ring spanner set from Stanley includes sizes 6 x 7 mm, 8 x 9 mm, 10 x 12 mm, 11 x 13 mm, 12 x 14 mm, 14 x 15 mm, 16 x 17 mm, 18 x 19 mm, 21 x 23 mm, and 22 x 24 mm. This module fits into a TransModul system workshop trolley. The ring spanners feature a 12-point Maxi-Drive profile that grips the flats instead of the corners. This ensures optimal power transmission and increased durability. Finish: matte chrome.