Advantus - AVT76417 Protect against identity theft with this Secure Two-Card RFID Blocking Badge Holder. This card holder blocks radio frequency identification (RFID) to keep you safe. Secure personal credit, debit and business ID card information by shielding from unauthorized and unknown access. Badge holder offers full access for quick, easy removal and replacement of cards. Maximum insert size is 2-1/8" x 3-3/8" (54mm x 86mm).