A more thorough explanation:

Definition: A criminal instrument is something that is made or adapted for criminal use or commonly used for criminal purposes and possessed under circumstances showing an unlawful purpose.

Examples:

• A lock-picking tool
• A ski mask worn during a robbery
• A crowbar used to break into a building

These examples illustrate the definition of a criminal instrument because they are all items that are specifically designed or commonly used for criminal activity. Possessing these items under circumstances that suggest an unlawful purpose, such as being found with them during a burglary, can lead to criminal charges.