Inner components and parts of a robot hand & fingers

Hello, everybody. Would you please tell me; with which components
We can fix, firm and unchanged the fingers bending at a certain time
[for grabbing an object]and return them back again whenever we want;
I mean the inner components that used for that purposes.

                 Thanks, :question:

Hello.

There are several things that can be used to make a robotic hand. Many people have had success using servos for their movement.

- Grant