Park Tool ATD-1.2With carbon fiber components and low torque specifications becoming more common on bicycle components, a torque driver is an essential tool for bike maintenance, adjustment and assembly. The ATD 1. 2 is a shop quality torque driver that limits torque applied to bolts and fasteners. The torque setting of the ATD 1. 2 is adjustable by hand to either 4, 4. 5, 5, 5. 5, or 6 Newton meters (Nm). Once the torque limit is reached, the tool gives a loud