A durable and reliable Birzman adapter that adds leverage for greater torque as you loosen and tighten the bolts and fixtures on your bike and other items. Also, this Wrench Extender works with a variety of tools. This CrMo and TPR-made addition works with a multitude of Birzman wrenches including chain whips, bottom bracket wrenches, freewheel turners and more. Specification: Functions: Modular wrench extension bar.,Material: CrMo / TPR..