difference between l and nd series

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The D series is knob trim and the ND series is lever trim.
The difference between the L and N escutcheons is the size and how they are manufactured. L Escutcheon: 8" x 1 3/4" x 7/16" (203mm x 44mm x 11mm) Cold-forged brass, bronze or stainless steel ...
Steelcraft does offer two types of seamless edge construction that support SDI classification standard Model 2 -seamless. Filled Edge: Epoxy fill, two part epoxy filled and dressed smooth. (LF, ...
ND93PD (ANSI F88) Vestibule LockLatch retracted by key from outside when outside lever is disengaged by key in inside lever. Inside lever is always unlocked.  ND95PD (ANSI F110) Classroom Securit...
ND50PD (ANSI F82) Entrance/Office Lock  Push-button locking. Push-button locks outside lever until unlocked with key or by turning inside lever. Inside lever is always free for immediate egress. ...