Emtek Round Knob Set with Rectangular RosetteAbout the Emtek Round Knob Set with Rectangular Rosette A contemporary classic and versatile Emtek profile, the Round Knob is subtle but stylish. Its smooth, flat front has spawned many a variation since its initial introduction. The Round Knob is available as a Passage Privacy set with additional base material options, all of which pair equally well with both modern and traditional style rosettes.