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2inch Square Robertson Head Screwdriver Bit Set with 1/4inch ...
Robertson Drive Screws: Flathead, #8, 1-3/4 inch | RobCosman.com
Robertson screw - Wikipedia
Owl Tools Robertson Square Head Screwdriver Set (5 Pack in the Following Sizes: #0, 1, 2, 3, and #4) Forged Steel with Magnetic Tips & Soft Ergonomic Handle - Amazon.com