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***Items to Consider***
-3/8" Screws are only compatible with 1/2" hangers.
- are recommended to hold the hanger to the screw during installation and travel.
-Holes for all stainless steel screw anchors MUST be drilled with a specific . Zinc plated screw anchors may be installed with any standard .
Click to read about how screw anchors are paving the way to new discoveries in some of the world's deepest caves.
Additional independent testing may be found .