Raytheon Instrument Knurled Knob - Military Use - 1/8" Inside Diameter - RN-205F-1MD 

• Knurled knob manufactured by Raytheon 
• Model: RN-205F-1MD
• Knurled design for better grip
• Brushed aluminum top, rest of body made from black thermoplastic
• Features two slotted setscrews to secure to shaft
• Brass insert fits 1/8" diameter shafts
• Dimensions: 0.68" High x 0.52" Diameter
• Originally manufactured for military use