uxcell 6063 Aluminum Round Tube, 300mm Length 16mm OD 5mm Inner Dia Seamless Aluminum Straight Tubing: Amazon.com: Industrial & Scientific
100pcs 5mm Dia 10mm Shank Flat Countersunk Head Aluminum Solid Rivets: Amazon.com: Industrial & Scientific
Amazon.com: uxcell Stereo Knob, 25x6x15.5 mm Aluminium Alloy, Volume Control Knobs, Silver Textured Surface 2pcs : Automotive
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: uxcell Aluminum 20T 5mm Bore 2mm Pitch Timing Belt Pulley with Dual Ball Bearing : Industrial & Scientific
Amazon.com: Houkr 6PCS Aluminum 20Teeth GT2 Timing Belt Pulley 5mm Bore 6mm Width, Synchronous Wheel for 3D Printer Width 6mm Timing Belt and M4 Wrench, for RepRap 3D Printer Prusa I3 :