CRAIN 500 SINGLE CASE STRETCHERThe No. 500 fixed head stretcher comes with a push button locking power handle, Auto Lok tube, 3 extension tube sections, 1 transfer tube section, and a folding tail block. The Auto Lok tube provides fast length adjustments in flexible increments. The tubes adjust from 37 inches to 23 feet, and can be lengthened with additional extension tubes (No. 502). The folding tail block allows you to stretch off walls, corners, or posts. The pin depth adjusting