Button Head Socket Cap Screw is a new kind of Socket Cap Screw, it has smaller head that can solve most problem of interfere with other components.
2.The DC Motor-37 Bracket in this kit may be DC Motor-37 Bracket A or DC Motor-37 Bracket B, they are in different shape but the usage are the same.
This Kit covers all the fucntions of Starter Kit, Advanced Kit and Ultimate, and adds LOTS of parts for extension, including two stepper motors and bracket.
Parts are packed in a translucent plastic tool box.
Guide for building the robots: