High quality slim style Chrome Vanadium steel spanners. Hardened, tempered with a polished mirror finish for corrosion resistance. 144-Tooth WallDrive(r) ratchet ring giving ultra-smooth action, requiring only 2.5 rotation to pick up the next tooth. Covers sizes 10 to 19mm. Open-end of the spanners have hex profiles with serrated jaws for extra grip. Supplied in storage/carry rack. One of a comprehensive range of Premier Hand Tools, suitable for daily professional use. High quality slim style Chrome Vanadium steel spanners. Hardened, tempered with a mirror polished finish for corrosion resistance. 144-Tooth WallDrive(r) ratchet ring giving ultra-smooth action, requiring only 2.5 rotation to pick up the next tooth. Sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm. Open-end of the.