Amazon.com: uxcell 6mm to 6mm Bore Rigid Coupling Set Screw L22XD14 Stainless Steel,Shaft Coupler Connector for 3D Printers, Motor Accessories,2pcs : Industrial & Scientific
Brass Connector 6mm Hex Coupling with Screws Flexible shaft coupler for Motor/Robot /small intelligent car
Amazon.com: uxcell 2mm to 6mm Bore Rigid Coupling Set Screw L20XD12 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Red : Industrial & Scientific
Amazon.com: HJ Garden 4pcs 6mm Brass Hex Shaft Coupling Motor Flexible Coupler Joint for Connecting DC Motor Shaft, Robot, Model Car Tyre etc. : Industrial & Scientific
4000 Series Clamping Shaft Coupler (5mm Round Bore to 6mm Round Bore) - goBILDA
Amazon.com: uxcell 6mm to 1/4 Inch Bore Rigid Coupling Set Screw L25XD18 Aluminum Alloy,Shaft Coupler Connector for 3D Printers, Motor Accessories : Industrial & Scientific
TA-VIGOR 2pcs 6mm to 8mm Bore Rigid Coupling D14mm x L22mm Stainless Steel Shaft Coupler Connector, Shaft Coupling Joint Connector for 3D Printer,DIY Robots, CNC Machine,Motor Accessories - Yahoo Shopping
4007 Series Hyper Coupler (6mm D-Bore to 8mm REX™ Bore) - ServoCity
Flexible Shaft Coupling 8mm to 6.35mm 6mm to 4.76mm Coupler Joint for RC Boats | eBay
6mm to 10mm Shaft Coupling Flexible Coupler Motor Connector Joint L25xD18 Silver - Walmart.com