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The Glynn-Johnson 410 Series Overhead Door Holder/Stop Concealed Mounting is the perfect combination of form and function, Glynn-Johnson 410 series holders and stops offer effective door control and a low-profile design. Each model is constructed so that the channel is encased in the door and the jamb bracket is mortised in the frame. When the door is open, the arm and jamb bracket are visible. Conversely, when the door is in the closed position, the entire holder is completely concealed.