Sicurix 47820 BAU47820 Proximity Card Holder, Vertical, Pack of 50. Credit card size badge holder has die-cut holes through front and back so RFID card cannot be removed when strap clip, barb or bead chain is attached. It completely locks in the valuable card for extra security. Badge size: 4-5/16 x 2-9/16". Maximum insert size: 2-1/8 x 3-3/8". Pack of 50 card holders. Clear front and back.