The Tulip Knobs and Knurled Collection are the latest additions to our Estate line. The Tulip Knob was designed with an elegantly raised edge that surrounds the outer rim of the doorknob. The Knurled Collection provides modern elegance in one sleek design feature. A gorgeous, smooth, diamond knurled design is the defining feature of this collection. Each collection is available in 15 different finishes, providing ample options for all your design needs and wants.