Park tool preset torque driver ptd 4this shop quality pre set torque driver limits torque applied to fasteners preventing over tightening and damage to lightweight components the ptd 4 features all metal internal construction with a comfortable ergonomic composite moulded grip each tool is assembled and calibrated at the park tool factory in minnesota features pre set to 4 nm inch hex drive includes 3 4 5mm and t25 bits stored in the handle limits torque applied to fasteners while rota