Privacy Mortise Lock from the Rope Series with Crystal Knob Nostalgic Warehouse door hardware adds the finishing touch of beauty and charm to your home. They offer unique styles, high quality materials, and supreme craftsmanship. Their products are made to order so that you can mix-and-match any knob with any style family in any finish to create your own distinct look. Whether you want to make a great first impression with an elegant handleset on your front door, bring out the vintage feel of your home with crystal interior knobs, or simply move from a rose to a long plate design to make a statement, Nostalgic Warehouse has the styles to fit the character of your home. The interior mortise lock function has an active latch with a skeleton key locking mechanism. This lock requires a special mortise door preparation for the mortise case to fit into. Top quality, forged brass products Vintage designs - updated for modern use Engineered for use on pre-drilled doors Fits Doors 1-3/8"