Features and Benefits: For loosening frozen or tight pins and keys, or knocking out rivets; Once loosened, follow up with a pin punch to drive the pin or key out; Black oxide finish; Tip is precisely machined to meet exacting tolerances; American made product; This Mayhew 3/32" solid punch is used for loosening frozen or tight pins and keys, or knocking out rivets. It has a black oxide finish for resistance against rust.