This is a thumb prosthesis with a claw or modified nail instead of the standard human nail configuration. This design allows for better grip due to the concavities and allows for greater presure to be generated at the tip due to thesmaller contact point. Why ???? If you have to replace a human part you can improve on natures designPrint this thumb prosthesis and custom fit by scaling in length and diameter. Further fit this by scaling radial bands around vertical axis.