repeatable bending angle apparatus incorporated into existing manually or pneumatically operated metal stock bending apparatus permits making a number of successive bends of metal stock having similar characteristics . a disk is rotatably mounted below the bending apparatus bending arm with its center located at the bending arm axis . the disk can be rotated and locked at any bending angle . in a first embodiment , using manual bending power , an upward extension from the disk into the bending arm path provides a stop for successive bends at identical angles . second and third embodiments use pneumatic power . the second embodiment utilizes a spring loaded insert from the stop to give the operator an indication of where to stop the apparatus at the desired angle before the disk will be rotated by the bending arm bearing against the stop . in the third embodiment the stop mounts a valve with a spring loaded extension which shuts off air to a pneumatic pump which stops the bending arm at the same angle when the bending arm depresses the valve extension for successive bends of equal angles .