All Emtek items are made to order. Emtek's passage knobsets use traditional American latches complete with a variety of trim styles, handcrafted from authentic materials. The knobset is operated by a knob from both the interior and exterior. With the passage function, the door does not lock from either side. Uncompromisingly rugged and beautifully crafted, these locks are suitable for the very finest homes.Note: Lancaster knob unavailable in Black Finish Common to both American and English hardware, porcelain knobs turn function into style. Sturdy and attractive brass rosettes accent these beautifully-crafted knobs. The latches are heavy-duty die cast construction, with strong internal springs, solid brass nose bolts, and sintered metal cams. A plastic bushing located in the joint between the handle and the rosette ensures a friction-free wear surface, preventing metal from bearing on metal and providing smooth, long-lasting operation. Handles are positively connected to rosettes with a permanent clip. Each has a set screw which eliminates "handle wobble" when tightened. Emtek's threaded tubes are machined brass to ensure good threads and prevent corrosion. Features: Standard Door Prep Porcelain Knob with Brass Rosette Specifications: Knob Diameter: 2-3/8" Projection: 2-1/4" Material: Porcelain and Solid Brass Door Thickness: 1-1/4" - 3" Backset: 2-3/8" or 2-3/4" Emtek is dedicated to bringing interesting, well made hardware back into American homes. Emtek's mission is to satisfy the higher expectations of today's homeowners with regard to door locks. They strive to provide a broad and interesting range of products that consumers can use as elements of decor, and not just as a way to latch a door.