A twist of 4 N•m is applied to the handle of the screwdriver. Resolve this couple moment into a pair of couple forces F exerted on the handle and P exerted on the blade.

Image from: Hibbeler, R. C., S. C. Fan, Kai Beng. Yap, and Peter Schiavone. Statics: Mechanics for Engineers. Singapore: Pearson, 2013.
Solution:
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Let us first look at the blade of the screwdriver. We can resolve the couple moment acted upon the handle into two force at the blade as follows:
(P)(0.005)=4
P=800 N
P=800 N
Doing the same at the handle gives us:
(F)(0.03)=4
F=133.3 N
F=133.3 N
Final Answers:
P=800 N
F=133.3 N
F=133.3 N
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