#10 Flat 4lug Robertson Wood-Maxx T17Wood Maxx #10 Flathead 4LUG Robertson T17 Stair & Railing screw. Multi purpose wood screw. HIGHLY recommended for high torque and sheer strength applications. Cling Fit Square Drive #3 Robertson Square Drive on most of the product line. Good snug fit on original Robertson Driver Bits. Smooth Shank Allows for better draw down. Zinc Wax Coating A special process unique to the Wood Maxx that reduces friction. Wood Maxx Lo Root Thread Aid in the
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