Crain 497 Case with Driving HeadCrain 497 Case with Driving Head includes the driving head, tail block, and transfer tube components of our fixed head stretcher along with the head case. The head case will additionally hold an Auto Lok tube and three extension tubes (not included with the No. 497). The head case has wheels for easy transport. The head case is made from a tough yet lightweight blow molded plastic with recessed latches and handles.