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Square Recess | Robertson Bits. Square Recess Bit: No. 1 (length: 25 mm). Packaging:Bulk (sold per piece). . A Robertson, also known as a square or Scrulox screw drive is specified as ANSI. Type III Square Centre and has a square-shaped socket in the screw head and a square. protrusion on the tool. Both the tool and the socket have a slight taper. As patents expired and awareness of their advantages spread, Robertson fasteners. have become popular in woodworking and in general construction. Robertson screw. bits are easy to use one-handed, because the tapered socket tends to retain the. screw, even if it is shaken. Universal hexagonal shaft in 6,35 mm (¼ inch).