Model 17BF PK - Female Brass Insert Ball Knob:
Material: Duroplast
Standard Colour: Black
Finish: Gloss
Female Insert Material: Brass
Model 17AF PK - Female Moulded Thread Ball Knob:
Material: Duroplast
Standard Colour: Black
Finish: Gloss
Thread: Moulded thread
Thread Diameter: Imperial and metric sizes