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
clamp Collar Double-Split Made of Aluminium, bore 20mm: Clamp On Shaft Collars: Amazon.com: 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: OdiySurveil(TM) 100 x 40 x 20MM Aluminium Heatsink Radiator Diffusion Cooling Fin Comb Heat Sink Cooler : Electronics
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Amazon.com: Front Fork Barrel Shaft, 20mm to 15mm Front Hubs Tube Shaft Axle, Aluminium Alloy Accessories for Bicycle(100 Open Gear) : Industrial & Scientific
Amazon.com : H World Shopping Airsoft Aluminium 45 Degree Offset Single Side 20mm Picatinny Weaver Rail Mount : Sports & Outdoors
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
Befenybay 2PCS 10mm to 10mm Aluminium Plum Flexible Shaft Coupling Diameter 20mm Length 25mm Connector Flexible Coupler for 3D Printer CNC Machine and Servo Stepped Motor(10x10mm): Amazon.com: Industrial & Scientific
ALUMINIUM ROUND BAR/ROD 4,5,6,8,10,12,16,20mm diameter (in many Lengths) | eBay