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2PCS 5mm to 8mm Aluminium Plum Flexible Shaft Coupling D20 L25 Connector Flexible Coupler for 3D Printer/DIY Encoder and Servo Stepped Motor: Amazon.com: Industrial & Scientific
Amazon.com: 1060 Aluminum Strip Aluminum Foil Strip,Easy to Machine Or Weld Etc.Length:5m,Thickness:1.0mm,Width:20mm. : Industrial & Scientific
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W224205 - Description : 20MM Crimped Seal FLIP-Cap White - Flip Cap, Aluminium Seal White Unlined, for Mouth OD (mm):20, Provide Tamper Evidence, Color: White - Case of 1,000: Amazon.com: Industrial & Scientific
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COMOK Silver Tone 20mm Inner Diameter Aluminium Alloy Linear Ball Roller Bearing Sliding Block: Amazon.com: Industrial & Scientific
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Amazon.com: OdiySurveil(TM) 100 x 40 x 20MM Aluminium Heatsink Radiator Diffusion Cooling Fin Comb Heat Sink Cooler : Electronics
Vial Crimper,20A 20mm Manual Vial Crimper Aluminum&Plastic Flip Off Caps Hand Sealing Machine (20mm Aluminium-Plastic Cap) - - Amazon.com