Actuator and Lens Components: Type - Control Knob; Color - Black; Size - 1.57"OD; Mounting - 0.250 Shaft hole, (2) 6/32 Set Screw; Material - Phenolic; Additional Information - Style: Ribbed Knob With White Square Indicator On Top; Manufacturer Series - PKX
Additional Info: Style: Ribbed Knob With White Square Indicator On Top