A hand tool, such as a motorized cordless ratchet wrench, is configured for reducing part count and reducing assembly processes. The hand tool includes a clamshell housing that may be fastened to a drive member such as a ratchet head assembly without the use of additional fasteners such as large clamp nuts or additional screw sets, for example. One or more protrusions extending inwardly from the clamshell housing engage similarly shaped voids in the ratchet head assembly. The protrusions tightly engage the ratchet head housing when the clamshell housing portions are fastened together.