Insert Heads for Torque Wrenches

Insert Heads for Torque Wrenches must be compatible with the torque wrench. Torque wrench Interchangeable Head In order to purchase the wrench head, the customer needs to look at the size of the end fitting. What is the size between 9x12mm or 14x18mm, which is the same size as the customer's wrench? To prevent errors in the implementation