These are all metal table clamps for your full-sized practice hands. In order for these clamps to work with your practice hands they have to be made with the "custom socket" in the wrist of the hand. See pictures above. I designed these to fit into the hand like this because I liked the fact the hand can rotate 360 degrees in either direction for ease of use while doing nails. I also added some silicone grips to the clamps so it wouldn't slide around on the table. The silicone gives the clamps an extra firm, no slip grip. 
 
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I priced these holders to include the extra labor to make the sockets into the hands, so if you order one of these metal "handy holders" I will automatically make your hand or hands with the custom sockets.