The 9/32 screwdrivers

Above are 3 M-21 Standard screw driver sockets

9/32 specialty screw driver sockets 1925 – 1945

Name	Description	Year first Appeared	Year Last Appeared
M-21	Std Blade Screw Driver -short	1933	1942
M-24	Std Blade Screw Driver ¼ blade width -long	1937	1942
M-25	Std Blade Screw Driver 3/8 blade width –long	1937	1942
M-26	Std Blade Screw Driver 3/16 blade width -long	1937	1942
M-27	Butterfly driver (Clutch – type) 175 diameter	1939	1941
M-30	Butterfly driver (Clutch – type) 242 diameter	1941
M-31	Butterfly driver (Clutch – type) 156 diameter	1941
MP-12 MP-12-2	Philip#1 with replaceable blade	1941	1942
MP- 22 MP-22-2	Philip#2 with replaceable blade	1941	1942

M-28	Phillips #1	1939
M-29	Phillips #2	1939
MH-3	3/32 male hex	1937
MH-4	1/8 male hex	1937
MH-5	5/32 male hex	1937

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Name	Description	Year first Appeared	Year Last Appeared
M-1	Adaptor for 3/8 handles and 9/32 sockets	1931	1942
A-6	Adaptor for 3/8 handles and 1/4 sockets	1939	1942
A-3	Adaptor for 9/32 handles and 3/8 sockets	1937	1942
A-8	Adaptor for 1/4 handles and 9/32 sockets	1941	1942

There are 2 basic socket styles. The first style exists from 1925 to 1929. After this, the newer style in a Nickel finish existed into the 1940 when Nickel shortages caused an oil finish to be used

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Name OLD KNURL STYLE	Description	Year first Appeared	Year Last Appeared
M-8	¼” Socket	1925	1929 est
M-9	9/32” Socket	1925	1929 est
M-10	5/16” Socket	1925	1929 est
M-11	11/32” Socket	1925	1929 est
M-12	3/8” Socket	1925	1929 est
M-14	7/16” Socket	1925	1929 est
M-408	¼ “ Square	1925	1929 est
M-410	5/16” Square	1925	1929 est

Above are the screw driver sockets, M-25, M-24, M-26, M-8, &M29

Name	Description	Year first Appeared	Year Last Appeared
MA-3, MA-3-2 , MA-3- 3	Allen Head Wrench, with 2 interchangeable blades short and long 3/32	1941
MA-4, MA-4-2, MA-4-3	Allen Head Wrench, with 2 interchangeable blades short and long 1/8	1941
MA-5, MA-5-2, MA-5-3	Allen Head Wrench, with 2 interchangeable blades short and long 5/32	1941
MA-6, MA-6-2, MA-6-3	Allen Head Wrench, with 2 interchangeable blades short and long 3/16	1941
MA-7, MA-7-2, MA-7-2	Allen Head Wrench, with 2 interchangeable blades short and long 7/32	1941

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