The hole, which is six sided, is actually in the head of the Allen screw or bolt, NOT in the wrench. The Allen wrench is a six sided tool steel bar made to very precise measurements and often, but not always, bent at a right angle at one end. Professional Allen wrenches almost always have a large 'T' handle to use as a grip, and are about 7-9 inches long, as opposed to the smaller ones you find in hardware stores. The Allen wrench principle is to allow more torque on the screw or bolt. Many mechanics even have an entire set of Allen bits to fit on their torque wrench.
Variations on the well known Allen head, (which has been around since 1912) are the modern Torx screw and the Bristol screw (much used in British aircraft industry) - All of these have a similar shape and a common principle of allowing more torque to be applied, and avoiding what is called 'cam out'.
Euclidean geometry, non euclidean geometry. Plane geometry. Three dimensional geometry to name but a few
There are different kinds of geometry including elementary geometry, Euclidean geometry, and Elliptic Geometry.
Archimedes - Euclidean geometry Pierre Ossian Bonnet - differential geometry Brahmagupta - Euclidean geometry, cyclic quadrilaterals Raoul Bricard - descriptive geometry Henri Brocard - Brocard points.. Giovanni Ceva - Euclidean geometry Shiing-Shen Chern - differential geometry René Descartes - invented the methodology analytic geometry Joseph Diaz Gergonne - projective geometry; Gergonne point Girard Desargues - projective geometry; Desargues' theorem Eratosthenes - Euclidean geometry Euclid - Elements, Euclidean geometry Leonhard Euler - Euler's Law Katyayana - Euclidean geometry Nikolai Ivanovich Lobachevsky - non-Euclidean geometry Omar Khayyam - algebraic geometry, conic sections Blaise Pascal - projective geometry Pappus of Alexandria - Euclidean geometry, projective geometry Pythagoras - Euclidean geometry Bernhard Riemann - non-Euclidean geometry Giovanni Gerolamo Saccheri - non-Euclidean geometry Oswald Veblen - projective geometry, differential geometry
Plane Geometry and Solid Geometry
Geometry that is not on a plane, like spherical geometry
hexagon
a hexagon
Hexagon
hexagon
Allen keys are hexagonal. The shape is a hexagon (6 sided figure).
Hexagon
An allen wrench is sometimes referred to as a hex wrench or hex key.
If you look by the shifter console there is a little cap or lid remove this and inside the hole is a little flange, either use a screwdriver or Allen wrench and push down on it. This will allow the key to turn. I acually leave the Allen wrench in the hole because sometimes it will act up. hope this helps
7mm Allen wrench
Allen Screws.
There is no Allen wrench, I believe it is 14 mm open wrench.
An Allen wrench is a hex head wrench - a screwdriver with a handle and hexagonal head at right angles to each other.