The 197170146 Cleco Livewire I-Wrench Interchangeable Ratchet Head, Torque Capacity (Nm): N/A allows for quick and easy changing of various sized sockets. The 197170146 Cleco Livewire I-Wrench Interchangeable Ratchet Head, Torque Capacity (Nm): N/A comes without tool recognition capability, but is machined ready for a tool recognition chip.