The AllPoints Foodservice Parts & Supplies 22-1242 Control Knob & Dial features a 1-1/8" diameter design with a 1/4" diameter hole, ideal for use with infinite switches. Constructed from durable black plastic and aluminum, this knob includes an indicator and set screw for secure installation. It is a reliable replacement for Merco models 000320 and 000320SP, ensuring compatibility and performance in your foodservice equipment.