A screwdriver includes a locking member, a positioning member, a retaining member, and a rotatable member. The locking member defines a locking member hole therein. The positioning member is received in the locking member hole, and defines first and second positioning member holes. An angled surface is located between the first and second positioning member holes. The retaining member secures the positioning member to the locking member, and defines a retaining member hole to receive the positioning member. The rotatable member is received in the first positioning member hole, and slidable to abut the angled surface to slide the positioning member from a first position where the rotatable member is positioned in the first positioning member hole, to a second position where the rotatable member is positioned in the second positioning member hole so as to splay the second positioning member hole.