Hardened and tempered carbon steel spanner set for adjusting cup and cone bearing races on bike axles. Slim design fits narrow lock nuts. Sizes 13/14mm and 15/16mm. Black painted finish for increased corrosion resistance. Hardened and tempered carbon steel spanner set for adjusting cup and cone bearing races on bike axles. Slim design fits narrow lock nuts. Sizes 13/14mm and 15/16mm. Black painted finish for increased corrosion resistance.