Screw drivers generally come in two different flavors. Flathead and Phillips. If you don’t know the difference and are unable to infer which is which in the photo, shame on your parents and your shop teacher. These quintessential life tools also play an important role in bicycle maintenance. A screw driver set is essential for derailleur adjustments, installing accessories, and taking stuff apart. I recommend a set of medium drivers and set of small. Test the grip before you buy, feel the weight in your hand. Ask the store clerk if you can take it for a test spin. Consider your options. Do you splurge for the magnetic tip? Is a rubber grip really your style or do the green and yellow plastic handles suite you just fine? Be confident, go with your gut on this one.