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2. Combination square - Wikipedia

   en.wikipedia.org/wiki/Combination_square

   The centre finder head can be used for: Marking lines through the centre of circular or square objects, such as dowels. Making multiple marks at different angles can be used to identify the point at the centre of the circle. Marking lines perpendicular to a curved edge (normal lines). Bisecting square corners to mark a 45° angle. [2]

3. Square (tool) - Wikipedia

   en.wikipedia.org/wiki/Square_(tool)

   Square (tool) A square is a tool used for marking and referencing a 90° angle, though mitre squares are used for 45° angles. Squares see common use in woodworking, metalworking, construction and technical drawing. [1] Some squares incorporate a scale for measuring distances (a ruler) or for calculating angles.

4. Speed square - Wikipedia

   en.wikipedia.org/wiki/Speed_square

   A speed square, also called a rafter square, rafter angle square, and triangle square, is a multi-purpose triangular carpenters' tool used for marking out. Its functions include many of those of a combination square, try square, and framing square. Carpenters use it to make basic measurements and mark lines on dimensional lumber, and as a saw ...

5. Sliding T bevel - Wikipedia

   en.wikipedia.org/wiki/Sliding_T_bevel

   Sliding T bevel. A sliding T bevel, also known as a bevel gauge or false square[1] is an adjustable gauge for setting and transferring angles. Different from the square, which is fixed and can only set a 90° angle, the sliding T bevel can set any angle and transfer it on another piece. The bevel gauge is composed of two elements connected with ...

6. L. S. Starrett Company - Wikipedia

   en.wikipedia.org/wiki/L._S._Starrett_Company

   Website. www.starrett.com. The L. S. Starrett Company is an American manufacturer of tools and instruments used by machinists, tool and die makers, and the construction industry. The company was founded by businessman and inventor Laroy Sunderland Starrett in 1880. The company patented such items as the sliding combination square, bench vises ...

7. List of screw drives - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_drives

   M6 and M8 triple square drivers End view of M10 triple square screw. The triple-square, also known as XZN, is a type of screw drive with 12 equally spaced protrusions, each ending in a 90° internal angle. The name derives from overlaying three equal squares to form such a pattern with 12 right-angled protrusions (a 12-pointed star).