What is a common defect of a chisel?

A mushroomed head is a common defect of a chisel resulting from repeated striking with a hammer or mallet. Over time, the repeated force can deform the metal at the end of the chisel, causing it to bulge or 'mushroom' outward. This deformation affects the chisel's performance, as it can lead to improper force distribution during use, impacting precision and control while cutting or chiseling materials.

Additionally, a mushroomed head can create safety concerns, as the deformed metal may cause the chisel to slip or deflect during use, increasing the risk of injury. Regular maintenance and proper striking techniques can help prevent this condition, making it essential for users to regularly inspect their tools to ensure they remain in optimal working condition.