This little piece of notched plastic is a Resistor Lead Bending Tool. Sometimes referred to as a “forming” tool, this little guy provides you with an easy and reliable way to get the exact distance between two resistor leads that you need to PTH soldering. The Resistor Lead Bending Tool is two-sided, with one side offering 0.4"-1.5" spacing for ¼ Watt resistors and the other side offering 0.5"-1.5" spacing for ½ Watt resistors.
Note: 1/6 Watt resistors and specific diodes can be used on this tool but you will need to make sure they are centered before attempting to bend them to your desired preference.
A great kit of 500 resistors with nicely organized. With ~25 resistors of 20 different values, All of these resistors are stapled into a tri-fold pack and clearly labeled. The back of the resistor kit even has a resistor color code look-up chart and a tab