Lezyne chain drive tool 910 spd 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 shop quality ergonomic chain tool contoured chromoly body and drive screw 910 speed compatible replaceable hardened steel breaker pin 1 spare included 4 spoke wrenches 2x mavic splined 2x square sizes silver weight 93g