Abstract: An apparatus for inserting angle plates or corners into channel flanges of ducts which is compact and mobile is described. The apparatus includes wheels for portability and a corner supply magazine which is in essentially a vertical position or an angle position relative to a base plate to permit utilization of the device in various environments and which permits the device to be utilized with duct sections having various shapes. The apparatus operates on a controlled cycle and once the cycle is started, a sequence of operations is automatically performed until the angle plate is inserted into the flange and crimped.