This Hilti X-U box nails, made of steel, is perfect for your concrete nailing needs. Measuring 2.5" or 62mm in length, this model is ideal for those who want to ensure that their nails are securely in place. With a system of measurement in inches, it is easy to use and reliable. The Hilti brand guarantees that you will receive nothing less than the best quality product, and this 100 piece box of nails is no exception.