The Von Duprin 6400 is a modular electric strike designed for mortise and cylindrical locks. This verasatile strike allows the installer to insert and lock in the deadbolt keeper or plug and deadlatch ramp anywhere within' it's 3-1/8 In. vertical opening to fit the latch positionand functional needs. This, combined with a 1/8 In. horizontal adjustment, makes this strike a good fit for installations where misalignmnet or a tight fit are a problem.