The OHMITE 5111E finger-grip knob with pointer is a crucial component for controlling rheostats and tap switches. This knob, measuring 23/8" in length, is designed to fit models H, J, G, K, and L. It is fastened to shafts using slotted set screws, providing a secure and reliable connection. The pointer assists in precise adjustments and monitoring of resistance levels, making it ideal for industrial applications requiring accurate control of electrical resistance.