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 87083 Technic Axle 4 with Stop | Rebrickable - Build with LEGO
LEGO Sets with Part 3705 Technic Axle 4
5 New LEGO Dark Stone Grey Technic Axle 4L w Stop 87083 gray cross axle end stop | eBay