Mechanic's grip
One of the many methods used in card tricks and cheating in poker is the mechanic's grip. The mechanic's grip is a basic method to hold the cards that allows you the ability to do more with the cards like and easy view of the top card's face or the ability to lift and select a card without the spectators knowledge.
To form the Mechanic's Grip, first hold the deck in your hand in the same fasion you might hold a hammer or tool. The cards should be laying flat in your palm with the longer side of the deck laying along the fingers. Take your pointer finger (1) and move it to the short side facing away from you. Take your middle finger (2) , index finger (3) and pinkie finger (4) and place them on the long side of the deck. Finally your thumb (5) holds the deck together on the long side opposite of the other fingers. With this grip, more of the deck should be covered by your hand, thus making it more difficult for spectators to see what you are doing.