The 2 Minute Drawer -- Zargen by Grass

The Zargen "2 Minute" Drawer System by Grass.
Create a fully assembled drawer in less than 2 minutes.

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Question? With a BB/F (box/box/file) pedestal. How would I lock all three drawers with a side mounted gang lock? The grass zargen slides are smooth on the outside with nothing that the gang locks could interfere with to prevent the drawer from opening. ????