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Original Robertson® Square Drive Screwdriver Black (#3)

  • Price : £5.00
  • Model Number : SQUARE03
  • Availability : In Stock Now
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A Robertson screwdriver (also called a square drive screwdriver) is a type of screwdriver with a square -shaped tip with a slight taper (in the same way that flatheads, Phillips , hex , and Torx have flat, ×-shaped, hexagonal , and hexagrammal tips, respectively). Robertson screws are used mainly in Canada , but are growing in popularity around the world, as they are one of the most reliable screwdrivers.

Canadian P.L. Robertson invented the Robertson screw and screwdriver in 1908 . He received a patent in 1909 , and later applied for and received other patents. The last patent expired in 1964 .

Robertson screwdrivers are easy to use one-handed (i.e., without using the second hand to hold the screw), in fact, when driving a screw one handed, the user can let go of the driver, and the driver will stay put in the screw (sometimes even when driving straight up). They also allow for the use of angled screw drivers and trim head screws.

Robertson-head screwdrivers are available in range of tip-sizes. A given driver's suitability for use with a particular size of screw is indicated upon its handle according to the following system of colour-coding.

  • Green (#1) — No. 5, 6 & 7 screws
  • Red (#2) — No. 8, 9 & 10 screws
  • Black (#3) — No. 12 and larger screws
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