Amazon.com: MXL 80T Timing Pulley, 8/10/12/14/15/16/17/20mm Inner Bore, Fit for Belt Width 6/9/10mm, Aluminium Pulley (Size : Bore 20, Width : for Belt Width 10mm) : Industrial & Scientific
Amazon.com: HIGHER MEN Durable Aluminium Alloy CNC Stepper Motor Flexible Couplings Black Diameter 20mm Length 25mm Shaft Coupler Clamp Reliable Quality (Inner Diameter : 8mm to 10mm) : Industrial & Scientific
Amazon.com: H&R Aluminium Wheel Spacers DR 20 MM 202345714 : Automotive
Othmro SDA20 x 15 Sealing Thin Air Cylinder Pneumatic Air Cylinders, 20mm/0.79inch Bore 15mm/0.59inch Stroke for M5 Aluminium Alloy Pneumatic Components for Pneumatic and Hydraulic Systems 1pcs: Amazon.com: Industrial & Scientific
Amazon.com: ZHIPAIJI Drone Motor Mount Seat Aluminium Alloy Accessories for DIY Quadcopter Frame Kit Parts Accessories 20mm 22mm 25mm Carbon Tube Metal (Color : Red for 20mm Tube) : Toys & Games