This Peterson pick is made from 0.018″ thick Government Steel and then pressed into a purple-tinted plastic handle. This is the second thinnest series of picks from Peterson. Although they are slightly thicker than the 0.015 picks, they are designed with the “Euro” neck reduction to improve access in cramped keyholes. They are designed to be useful for locks with narrow keyholes and to provide a little more strength than the 0.015 picks.

They are incredibly useful for locks with narrow keyholes.

Keep in mind that these picks are specifically designed to provide access in narrow keyholes where standard picks will not fit. This narrowing of the width naturally makes the picks slightly less sturdy.
If you want to use these thin picks in wider keyholes, it means you no longer have the lateral support of the two walls in the keyhole. For narrow keyholes, this lockpick could still get support from this though. If you are heavy handed, these picks may bend sideways or even break under high pressure in locks with wide keyholes.