The OHMITE 5110E finger-grip knob is a crucial component for controlling rheostats and tap switches. It's designed for models H, J, G, K, and L, offering a reliable and secure connection via slotted set screws. This knob provides a comfortable grip and is a standard hardware accessory for industrial equipment, ensuring precise control and ease of operation. It's a vital part for maintaining and repairing Ohmite rheostat systems.