Amazon.com: KAISH 2pcs 51/64"(20mm) Diam. Aluminium Potentiometer Knobs 1/4" Universal Metal Pot Control Knobs for Guitar/Bass/AMPS Amplifier/Preamps/Efffect Pedal/Audio Equipments Black with Indicator Line : Industrial & Scientific
Amazon.com: uxcell Aluminium Sink Cooling Fin Heatsink 50mm x 50mm x 20mm Silver Tone : Electronics
Linear Rails Aluminium Alloy 12/16/20mm SBR Linear Rail Shaft Stop Collar Shaft Limit Fixing Ring CNC Parts - (Color: 16mm): Amazon.com: Industrial & Scientific
Amazon.com: SHHMA Aluminum Flat Bar Aluminium Bars Plate,Suitable for The Production of Industrial Accessories, 10 Pieces,5mm x 20mm : Industrial & Scientific
Amazon.com: Forgefix Aluminium Rivets 4.8 x 20mm Bag 100 : Industrial & Scientific
Amazon.com: Aluminium Alloy Tattoo Grip 20mm, Tattoo Machine Part Handle Tube Tip Grip Body Art Accessory With Back Stem(Black) : Beauty & Personal Care
Amazon.com: 8M 40Teeth Timing Belt Drive Pulley 20mm Bore 8mm Pitch For 30mm Width Belt 8M40T Synchronous Wheel without Step Aluminium Alloy (tooth width: 32mm, bore: 20mm) : Industrial & Scientific
Amazon.com: TEYWET Coupling 6/8/9/10/12/14/16/18/20mm CNC Aluminium Alloy for Stepper Motor Couplings for 3D Printer Metal (Inner Diameter : Other) : Industrial & Scientific