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Best Choice YINETTECH 
YINETTECH 10pcs Car Phone Mount Screw-On Ball-Joint Adapter Tightening Nut for 17mm Ball Adapters for Camera DVR Camcord Designed for 17mm ball-joint adapters, making it suitable for car phone mounts, camera brackets, DVRs, camcorders, and wBest Value OTOTEC 
OTOTEC 50Pcs 20 Series T Nut M5 M6 Roll in Spring T-nut with Ball Aluminum Profile Accessories for Aluminum Extrusion 3D This 20 series ball bearing T-nut is perfect for building industrial aluminum frame structures, 3D printers, CNC routersJaxenor 
Jaxenor Hanging Truck Balls Nuts - Add Style and Stability to Your RC Car Realistic Design: Zinc alloy material and fine workmanship create a realistic and vivid look for your RC car.Auto-plaza 
100 PCS Carbon Steel M8 T-Nuts Roll-in Spring, T-Slot Nuts Ball Nut 8 fit for European Standard 4040 and 4080 Series Alu Made of carbon steel, nickel plated on the surface, resistant to rust, corrosion, and high strength.YIPUKIYI 
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Appluxcell uxcell Ball Screw BK10/BF10 End Supports with Metal Ball Screw Nut for CNC Machine 1 Set Size - BF10: 60 x 20 x 39mm/2.36 x 0.79 x 1.54 inch(L*W*H); BK10: 60 x 25 x 39mm/2.36 x 0.98 x 1.54 inch (L*W*H)). 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