Crain 499 double case fixed head carpet stretcher comes with a push-button locking power handle, Auto-Lok tube, 3 extension tube sections, 1 transfer tube section, folding tail block, and separate head and tube cases. The Crain Power Stretcher 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 knob on the driving head provides variable pin depth settings, without the screws or screwdrivers found on other stretchers. Model No. 499 carpet stretcher comes with separate head and tube cases that distribute the weight and provide room for additional components. Crain 499 double case carpet stretcher head case has built-in wheels, and the tube case hooks on for transport.