The function of the hand is to precisely grip and perform the intricate functions. The grasping power is also strong in humans when compared to apes because the thumb is in opposition of other fingers. Also the thumb is larger when compared to the other fingers and the palm.
Hammer grip- This grip is formed by bending all of the fingers into the palm, and bending of the thumb, to lie outside the palm.
Baseball batter grip- both hands hold the cylindrical object with thumb lying outside the gripped hand
Precision grip (tip to tip)- The tip to tip connection of the fingers is caused by bending of the fingers, with bending and opposition of the thumb to touch the tip of the finger with the thumb
Key grip- it involves the thumb and the fingers middle bone to hold the object mostly the key.
Hook grip- All the finger take part except the thumb is usually not involved eg holding a bag handle
Tripod (pen) grip- the thumb index finger and the middle finger come together to hold the object.