A tool head includes a connecting component, a driving component, and a spacer assembled together. The connecting component includes a receiving end forming a first compartment and a second compartment. The driving component includes an engaging end forming a first engaging section and a second engaging section. The tool head has a tight-fit region in which the first engaging section and the spacer are tightly fit within the first compartment and a fit region in which the second engaging section is retained within the second compartment.