Zener Diode Various Voltages 500mW 2% (Pack of 2)

20k Ohms 1/2W Trimmer Potentiometer Top Adjustment

28MM Metal Alligator Clip Crocodile Electrical Clamp Testing Probe Black and Red with silicone boot 

A set of 2 quality 3mm screwdrivers with rotating palm rest

1x Star Screwdriver

1x Flat Scredriver 

ON/OFF button type switch 

Double Sided Copper Prototype PCB Circuit...

The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications. 

5V 30A 5-pin relay.