Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Hands for VR: Basic Free.
Hands for VR Basic v1.0
“Hands for VR: Basic” aims to bring hand models to Virtual Reality developers. 12 Meshes cover all your needs: low, med and high poly female and male hands, each left and right, fully rigged. An idle- and a grab-animation are included.
– Lowpoly Hand Meshes: Left/Right for Female/Male (Male/Female 1140 Tris)
– Medpoly Hand Meshes: Left/Right for Female/Male (Male 1998 Tris, Female 2228 Tris)
– Highpoly Hand Meshes: Left/Right for Female/Male (Male 8034 Tris, Female 8938 Tris)