This grasping, also known as power grip, is supplemented by the precision grip between the thumb and the distal finger pads made possible by the opposable thumbs.
The primary role of the hand itself is grasping and manipulation; tasks for which the hand has been adapted to two main grips power grip and precision grip.
Researchers first analysing it in the 1960s thought of it as human-like partly because of its potential for a precision grip -- essential for tool manufacture.
For opposition and therefore precision grips, several factors are necessary: adequate thumb position, adequate length of the thumb, stable joints and adequate thenar muscle or thumb strength.