Emtek Modern Square Glass Knob Set with Disk RosetteAbout the Emtek Modern Square Glass Knob Set with Disk Rosette Our 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.