A chain breaker is one of those tools that you just kind of take for granted. You can get away with an attachment on a multi tool, but once you've used a precise, shop quality chain breaker you won't want to go back. A well designed, comfortable chain tool like the Lezyne Chain Drive can make all the difference between a smooth, well executed adjustment and a drawn out frustrating mess. After all, those multi tool attachments were made to be used during your ride as a last ditch, ride or walk quick fix. Precise adjustments should be left to a shop quality instrument. The Lezyne Chain Drive Tool is tough. The forged steel body is CNC machined to tight tolerances for accuracy. The body is contoured to feel comfortable in your hands. Lezyne even integrated two Mavic splined and two square spoke wrenches into the body for a little extra versatility. The breaker pin can be replaced in the unlikely event of a break, and Lezyne even had the foresight to include a spare just in case. The Lezyne Chain Drive Tool is compatible with nine or ten speed chains and can be used for adjustment of wheels equipped with Mavic splined or standard square spoke nipples.