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Best Choice Lokkr 
Lokkr 5PCS Flexible Couplings 5mm to 8mm Set, Aluminum Connector Flexible Coupler for 3D Printer CNC Machine, DIY Encode ➤High Quality Material: Made of high-quality Aluminum Alloy, Surface oxidation treatment, durable, fine workmanship and
Coupling EMSea 
EMSea 5Pcs Brass Shaft Coupling Sleeve Coupler Motor Transmission Connectors with Grub Screws 2-3mm 2-4mm 4-4mm 4-6mm 6- 5 Pcs brass joint motor shaft coupling adapters, ideal accessories for RC Model motor, such as airplane boat model.Best Value WYJREES 
WYJREES 10 x Air Hose Fittings Nitto Type Male Coupler Compressor Couplings Air Tools Premium Material：This nitto air fitting use nickel-plated copper,it is harder,Durable and anti-corrosion,and have longerSluffs 
5Pcs 6mm Flange Shaft Coupling Flange Coupling Connector Rigid Guide Model Coupler Accessory Shaft Axis Fittings for DIY Durable Material: Coupling connector is made of steel. Heating and electroplating process make it firm and insulated, anCreate idea 
Create idea 18mm Square Brass Coupling Square Brass Coupler 3D Printer Coupling Parts T8 Z Axis Coupling Compatible with [Enhanced Compatibility] Compatible with Creality CR10/CR-10S Pro/Ender-3/S/Pro/V2 3D Printer, offering a precise fit foBE-TOOL 
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