The 11K5028-KMNB is a Style 5028 control knob intended for use with encoders and rotary switches. This black knob is constructed from nylon and is designed to fit a 0.250-inch diameter shaft, secured via a metal insert with set screw(s). It has a top diameter of 0.710 inches and a height of 0.730 inches. As a standard fit for Grayhill components, this knob provides a durable and reliable interface for user control in various electronic applications.