This is a knuckle hinge piece of MicroRAX product used as a bracket to allow beams to pivot on the edge or use in a building system to build science, engineering, or advanced hobby and DIY projects.

The knuckle hinge allows beams to pivot end-to-end with about 90 degrees of rotation. The bushing that connects the joint works with a 3mm OD shaft if you want to run a shaft through several joints. 

We are selling these as single joints so you'll need two of these to make a full knuckle (one per side).

Features:

• +/- 90 degrees of rotation
• Bushing works with 3mm OD shafting
• Need 2 to build a complete knuckle