gbk99The Von Duprin 99GBK-CV-SP28 9899 Series Glass Bead Kit. For 9899 Surface vertical rod exit devices. Glass bead conversion kits are available for all 9899™ series devices for use on doors with raised glass beads.gbk99_ Report abuse. Cookies. What would you like to report to team? Spam, Malware or Phishing. Sexually explicit. Violent or Dangerous. Hate speech, Harassment or