uxcell 4 Pcs Blue Yellow Plastic Shell Amplifier 4mm Banana Binding Post Adapter Product Name : Binding Post;Thread Dia. : 2.7mm/ 0.1" Fit Banana Dia. : 4mm/ 0.16";Overall Size : 44 x 11mm / 1.7" x 0.4" (L*Max.D) Main Material : Metal,Plastic;Main Color : Blue ,Yellow Gold Tone Net Weight : 59g Package Content : 10 x Binding Post