Its a rigged hand using only weights, no corrective shapes are used so its deformation system is rather simple, the bones weights are however painted well enough to support a number of poses. 

For version 1_6 I'm starting to use corrective shape keys, and also the rig is now controlled using AutoRig Pro.

However the version that is using Rigify is on the zip files for the product, and all the versions of the hand will always be available,

from the first to the last.

I created it so I could pose the hands of my 3d printing character easier and faster, since adding the hands is the most time consuming part of my sculpting process, I thought that maybe some other people could use it to their benefit, its a bare bones hand, but if you are in a hurry for a simple serviceable hand, I think this product will do the trick for you, as it did for my projects.

Usage:

I manly use it as my base setup for 3d printing sculpting.

Steps:

1. I pose the hand into my character arms, do any changes in proportion before hand, so  the hand is slimmer or thicker.
2. remove the armature and freeze the mesh 
3. go into sculpt mode and re-mesh the hand and sculpt some more detail into it, and fix any kinks the mesh might have.
4. Merge hand into the overall sculpt when needed.

I hope you find it useful, Cheers!!

---Change log---

I added a zip with version 1_3

I improved some of the deformations so a claw like shape could be better attained,

and added a animation key so it can be easily used as a start position.

1_4

Small deformation fix on the thumb side.

1_5

Greatly improved the thumb deformation/weight-paint and palm deformation,

it now can attain some more complex poses related to the thumb.

1_6

For this version I'm starting to use corrective shape-keys, I'm not done implementing them but the system is working well so far, I will do some more corrections to the fingers, and some extra to the thumb palm area, then call it done (that will be version 1_7)

The current corrective keys make the palm deformation a bit more accurate so it can be better used as reference, or as a starting point to sculpt.

Currently I'm using Auto-rig Pro as the main rigging system.