Mikano Athletics Stopper Needle Decoupler $ 6.04 Product information: Material: stainless steel + aluminum alloy Specifications: small crucian carp needle/large crucian carp needle/mixed fish needle Applicable: small crucian carp (2.5 for 1-4 taels), big crucian carp (3.0 for 5-8 taels), polyculture (4.0 for 9 taels-2 pounds) Size Information: Needle seat inner diameter: 4.5mm2 Needle seat diameter: 12mm Base Diameter: 12mm 4 Screw Diameter: 12mm Packing list: Decoupler*1