As an industrial and scientific user of power tools, I tested these staples on various materials and found that they had a sturdy hold... The galvanized finish added durability and made them corrosion-resistant making them a great long-term investment. The only downside is that they were a bit pricier than other staples, but the reliability and strength outweigh the cost. Overall, a top-notch choice for any professional in need of reliable staples for pneumatic guns..