Attach one of these tools between a socket and a torque wrench to increase the amount of force the wrench can provide and reduce the amount of effort required to turn large fasteners. Torque multipliers are useful when a shorter wrench handle must be used due to space limitations. Gears inside the multiplier increase the amount of applied torque by a specific ratio, and an audible click signals when the desired torque has been reached. The multiplier has a reaction bar that is braced against a secure fixture to stabilize the tool during operation. These tools can be used in a clockwise or counterclockwise direction and have female input/male output square drives.