The Lezyne Chain Drive is a shop quality chain breaker designed for use with 8/9/10 speed chains. The steel body is CNC machined for precision & contoured for enhanced ergonomics. The replaceable breaker pin is made from hardenend steel & a spare pin is included. Two Mavic splined & two square spoke wrenches are integrated into the body. Specs WEIGHT: 93g WRENCH: Mavic Splined Road & MTB 3.22 3.45