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AI-000210T - 4mm Banana Plug with Threaded Stud, Solder Tab - Mueller Electric
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Solder-Free Stackable Banana Plugs 4mm - Pack of 5 Multi-Color : ID 3694 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: CNCESS CESS-053 Banana Plug to Pin Plug Adapter, 4mm Female to Male Screw Type Banana, 4 Pack (Straight PIN) : Musical Instruments