7piece Refrigeration Torque Wrench Spanner Set - Part # STW-077 Piece Changeable Spanner Torque Wrench Click Type. Part No. STW 07. Heavy duty torque spanner set for refrigeration. Includes torque wrench click type handle & 6 interchangeable spanner heads. Suitable for sizes 17mm, 22mm, 24mm, 26mm, 27mm & 29mm. Range 10 Nm 75 Nm in 1 Newton Metre increments. This is a high quality product which will provide years of service. Necessary item when installing split system air conditioners and other systems with