The 197179036 Cleco LiveWire I-Wrench Interchangeable Open End Head, Torque Capacity (Nm): 250 allows is for applications with limited clearance or fixed bolt sizes. The 197179036 Cleco LiveWire I-Wrench Interchangeable Open End Head, Torque Capacity (Nm): 250 includes a built-in programmable chip for application error-proofing.