Site coded 26bit Wiegang Format Clamshell HID Proximity Card with 1.8MM thickness and Proximity Card Frequency 125KHz, slightly thicker than a standard ISO CR80 Credit Bank Card. Commonly slot at one end for standard Yo Yo or Lanyard clip. How To Program HID Proximity Cards? 125Khz Rfid Proximity Card HID ordering code number for the ISO Standard 26-bit format is H10301. The H10301 has 255 possible facility codes from 1 to 255. There can reach up to 65,535 card ID numbers, from 1 to 65,535, per facility code. The total number of cards that can use the entire range without duplication is 16,711,425.