Rampage jackson Posted August 13, 2011 Share Posted August 13, 2011 what kind of grip strength i use when im Insert screw with a screwdriver ? im mean for example when you insert the screw in tree deeper and deeper with screwdriver It becomes hard and harder Quote Link to comment Share on other sites More sharing options...
KBmania Posted August 13, 2011 Share Posted August 13, 2011 That motion is called supination and pronation. The main muscles used in supination are: supinator and short head of biceps brachii. The main muscles used in pronation are: pronator teres and pronator quadratus. Quote Link to comment Share on other sites More sharing options...
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