Designed to keep your valuable, high-tech proximity card safe, clean and secure, Advantus Proximity Badge Holders are a must-have item for any company. Each clear holder is sized for a 3.38 x 2.38 inch insert in a vertical orientation with the opening on top. Just thread a strap clip or neck chain adapter (sold separately) through both sides of the pre-punched hole on the badge holder to lock in place. Badges or ID cards will be securely protected from the elements and the clips will make them easy to access for swiping at security checkpoints. Available in a box containing 50 badge holders, these are an excellent choice for small or large office use.