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Slotted

1/16, 5/64, 3/32, 1/8, 9/64, 5/32, 3/16,
7/32, 1/4, 5/16, 3/8, 7/16, 1/2

There are several different tip configurations of slotted screwdrivers, on both round and square shanks. Keystone (Flared Sides) are manufactured on Square shanks. Cabinet (Straight Sides), Electrician (No Sides) and Cut (No Sides) are manufactured on Round shanks.
Combo-Drive®
CD-2
Phillips
No. 0000, No. 000, No. 00, No. 0, No. 1, No. 2, No. 3, No. 4
Pozidriv®
No. 0, No. 1, No. 2, No. 3, No. 4
 
Reed-Prince
(Fearson)
3/16, 1/4, 5/16, 3/8
Phillips
Square-Driv®
PSD 0-1, PSD 1-2, PSD 2-2, PSD 3-3
Torx®
T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40, T45, T50, T60, T70, T80, T90, T100
Hexagon
(Ball-Hex)
.028, .035, .050, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64,
5/32, 3/16, 7/32, 1/4, 5/16, 3/8
 
.7mm, .9mm, 1.3mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 4.0mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 10.0mm, 12.0mm
Square Recess
(Robertson®)
#0, #1, #2, #3, #4