Lezyne chain drive tool 910 speed lezyne chain drive tool shop quality chain breaker designed for use with 910 speed chains forged steel body is cnc machined for tool accuracy and contoured for improved ergonomics replaceable breaker pin is made of hardened steel spare pin included 2x mavic splined and 2x square spoke wrenches are integrated into the body making this an extremely compact and versatile tool features weight 93g wrench mavic splined road mtb 322 345 cnc machined 11 s