Screwy Irregulars Question

[Ronn! Blankenship]

I have a new lawn mower.  According to the instructions I need to 
change the oil before using the mower again (the instructions say to 
change the oil after the first 5 hours of operation, which is about 
how long it ran mowing the whole yard twice, which is what I've done 
with it up to now).  The drain plug is in the form of a screw with a 
square-shaped recess in the outer end.  I know that the tool used on 
such a screw with a hexagonal recess is sometimes referred to as an 
"Allen" wrench.  Does anyone know what the proper name is for a tool 
that fits a screw or bolt with a square-shaped recess in the head, so 
I know what to look/ask for?

. . . ronn! :)

I always knew that I would see the first man on the Moon.
I never dreamed that I would see the last.
        --Dr. Jerry Pournelle



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