Sq.recess no.1 insert bit

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)