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From the Manufacturer
GRK Caliburn Concrete Screws are professionally engineered fasteners with a patented thread design for ease of driving the screw in concrete and similar applications. Available in three different head designs for multiple applications. Recommended for use with GRK Drill bits. Caliburn Screws are available with a standard flat head design, pan head PH and washer head XL.
Long time customer
Reviewed in the United States on January 2, 2025
These put Tapcons to shame. The heads are super sturdy, they grip extremely well when installing ledger boards. Tapcons have a problem with the heads twisting off. It will never happen with these! Worth every penny.
Jordan Love
Reviewed in the United States on December 8, 2017
these are impressive and seem to not strip out the hole like tapcon
ssh hi
Reviewed in the United States on October 11, 2016
Absolutely the best concrete fastener out there. Easy to install and plenty of holding power. I anchored 4x4 post brackets with these screws and WOW!! Well worth the $$$
Honukane
Reviewed in the United States on December 20, 2012
What you see, is what you get. This is a great item to use to anchor whatever you working on, in concrete.
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