Amazon.com: LEGO TECHNIC 100 pcs BLACK AXLE SIZE 4 STUDS STUD LENGTH Cross Rod Short Mindstorms robot motor part piece 3705 NXT ev3 robotics : Toys & Games
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Lego 5 Black Technic Axle 4 Pieces | eBay
LEGO Axle 6 (3706) | Brick Owl - LEGO Marketplace
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87083 LEGO Parts~(4) Technic, Axle 4 with Stop DARK BLUISH GRAY | eBay