Technic Brick Modified 2 x 2 with Solid Ball and Axle Hole

Technic Brick Modified 2 x 2 with Solid Ball and Axle Hole (part 57909a) is a Technic Special used in 52 official LEGO sets. Scan or search to authenticate loose parts and check market value. Open the parent-set list to see which themes and years used this mold — essential when a common shape appears in a rare color or print.