A tool apparatus comprises an operative member and a handle connected to the operative member. The handle comprises a core element having an elongated body, an outer surface and first and second ends opposite to each other. At least the second end is connected to the operative member. The tool handle also comprises at least one cavity extending inwardly from the outer surface of the core element and a plurality of insert blocks selectively receivable in the cavity. The tool handle further comprises an overlay disposed on the core element, wherein a height of the projection on exterior surface of the insert block is no less than a thickness of the overlay, thereby exposing the upper surface to an external environment so as to be visible to a viewer.