3/8 inch Allen wrench.
An Allen wrench is a name given to a specific brand of hex key wrench. The name Allen wrench is often used regardless of the specific manufacturer (like aspirin for any pain reliever)The wrench was manufacured by the Arthur Allen Manufacturing Company Incorporated (since 1958). The original plant was in Chicago Illinois.The company was founded by John A. Lock Sr.,
It would be either a 15 mm wrench or a 7mm Allen key.
An allen wrench is sometimes referred to as a hex wrench or hex key.
7mm Allen wrench
I think that one is a 3/8 Allen.
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.
No they are NOT the same.
James Van Allen didn't invent the Allen Wrench it was William G. Allen in 1909-1910 of the Allen Manufacturing Company of Hartford, Connecticut.
To fasten and unfasten Allen screws and bolts. These fasteners have a hexagonal slot in the top into which the Allen wrench or key fits.
Allen screw drivers are similar to Allen keys. This tool is using for tightening or unfascinating hexagonal socket head screws.