Amazon.com: LEGO 50pc Technic gear & axle SET : Toys & Games
Amazon.com: LEGO Technic Axle Starter Pack : Toys & Games
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
LEGO part 3705b - Black Technic, Axle 4 Threaded at BrickScout