1840-6630, Clear Plastic Vertical Locking Card Holder, 2.28" x 3.8" Clear Plastic Vertical Locking Card Holder, 2.28" x 3.8" These clear polycarbonate holders feature a locking end piece that snaps securely into place, locking cards inside. Guard key (product #1840-6610, sold separately) opens the lock. Holds two 20mil (750mic) cards. Features: Protects IDs from tampering Vertical top-load with slot