CONTEK SCREW
Description: This is double-pitched (threads go at different diagonal directions) with a recessed Phillips or 5/16 hex head. They are zinc chromate-plated.
Buying information: Contek screws are excellent for securing boards to concrete, and are much safer than masonry nails.
How-to hint: These screws must be installed with a masonry drill bit and cordless drill. They screw into the cement.
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