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Product Description Torque Adapter, SAE, Drive Size 3/8 In., Number of Points 12, Overall Length 2-11/16 In., Steel, Full Polish Finish From the Manufacturer Proto torque adapters are designed with a center-to-center dimension of 2". This means that the distance from the center of the square drive of the mating torque wrench to the center of the fasteners is exactly 2". This constant dimension serves to simplify the process of calculating the torque applied. The box end wall thickness is specially engineered to provide strength while still allowing ample room for access to reach difficult fasteners.