Anatomical evidence from fossilized hand bones suggests that the precision grip needed to make and use stone tools was present:

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Anatomical evidence from fossilized hand bones suggests that the precision grip needed to make and use stone tools was present in Homo habilis and some australopithecines. This is supported by the discovery of fossilized hand bones that show elongated thumbs and curved fingers, similar to the hands of modern humans who use tools. Moreover, Homo erectus and other Homo species have also been found to have this type of grip, but it was first present in Homo habilis and some australopithecines.

Anatomical Evidence from Fossilized Hand Bones Suggests That the Precision