For Collectors and History Buffs
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
M-25
Std Blade Screw Driver 3/8 blade width –long
M-26
Std Blade Screw Driver 3/16 blade width -long
M-27
Butterfly driver (Clutch – type) 175 diameter
1939
1941
M-30
Butterfly driver (Clutch – type) 242 diameter
M-31
Butterfly driver (Clutch – type) 156 diameter
MP-12 MP-12-2
Philip#1 with replaceable blade
MP- 22 MP-22-2
Philip#2 with replaceable blade
M-28
Phillips #1
M-29
Phillips #2
MH-3
3/32 male hex
MH-4
1/8 male hex
MH-5
5/32 male hex
NameOLD KNURL STYLE
M-8
¼” Socket
1925
1929 est
M-9
9/32” Socket
M-10
5/16” Socket
M-11
11/32” Socket
M-12
3/8” Socket
M-14
7/16” Socket
M-408
¼ “ Square
M-410
5/16” Square
Above are the screw driver sockets, M-25, M-24, M-26, M-8, &M29
MA-3, MA-3-2 ,MA-3- 3
Allen Head Wrench, with 2 interchangeable blades short and long 3/32
MA-4, MA-4-2, MA-4-3
Allen Head Wrench, with 2 interchangeable blades short and long 1/8
MA-5, MA-5-2, MA-5-3
Allen Head Wrench, with 2 interchangeable blades short and long 5/32
MA-6, MA-6-2, MA-6-3
Allen Head Wrench, with 2 interchangeable blades short and long 3/16
MA-7, MA-7-2, MA-7-2
Allen Head Wrench, with 2 interchangeable blades short and long 7/32