Abstract: A security device for a door utilizes a first bracket member attached proximate one jamb of a door with a chain attached to said bracket and adapted to be fastened to a second chain engaging bracket member fastened proximate the other jamb of the door. The chain engaging bracket generally defines a U-shaped member having a first leg, a second leg and a saddle. The first leg is adapted to be attached to the jamb or building frame adjacent the door. The second leg comprises slots adapted to receive the links of a chain proximate the end of the legs. The saddle also comprises a slot adapted to receive a link of the chain. The chain is wrapped around the chain engaging bracket whereby a link of the chain is first received and engaged in the slot in the saddle. Then another link of the chain is received and engaged in the slot in the leg distal the slot in the saddle. The path of the chain then passes up for a link to be received and engage a slot in the leg proximal the slot in the saddle.