Emtek Concealed Fastener Modern Square Glass Knob Set With Disk RosetteOur Modern Square Glass Knob turns the classic style circular door knob tradition on its head. A great way to carry a geometic theme through a modern home, the Modern Square Glass Knob is a playful way to add an unexpected detail to your doors. As with all of Emtek's products, you can mix the finishes or styles at no additional upcharge or lead time.