The COG1218LS is a premium quality cog and lockring wrench that has been downsized so that it can be easily stored in a gear bag. 

Made of heavy gauge black trivalent chrome plated steel and measuring 260mm in length, it's more compact and lighter than the 330mm Runwell COG 1218L, but can apply enough torque that it has been certified as one of the tools provided to students at Japan Institute of Keirin. 

One side can be used on 12-15t cogs and features replaceable plates to install and remove lockrings, and the other side can be used on 16-18t cogs.

For use on steel cogs only. Do not use on aluminum cogs.