Ball-Insert Preset Nut for PG20 Profile M4 (pack of 4)

Obstacle Avoidance Reflection Photoelectric IR-Sensor

40x45mm Solder-less Prototype Mini Breadboard - 170 tie points. 

Preset-Nut AKA Slide-In Nut For all 20mm Profiles. Fits V-Slot and T-Slot profiles.

BPW34 photocell DIP-2

• 40mm NEMA 17 Stepper motor 1.8deg/step
• 17HS4401

A "PS2" type joystick mounted on a pcb with pin headers. Make your own joystick controller with an Arduino. 

T-Nut (or T Nut) made for easy assembly of products that uses 20mm x 20mm V-slot aluminium extrusions.