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“ what are glass bead kits? ”

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Resolution: Shim Kits, GBK,SK19R, SK18RMC, SK17RMC, SK19V, SK18V, SK17V:

Can Von Duprin GBK's be stacked up to clear a 9/16" glass bead on a fire door?

Resolution: You can only use one GBK Glass Bead Kit (1/4") per device on fire rated openings. Glass Bead Kit is for use on doors with raised glass beads.:

GLASS BEAD KIT (Abbreviation)

Resolution: GBK: