Crain 500 single case carpet stretcher fixed head 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 knob on the driving head provides variable pin depth settings, without the screws or screwdrivers found on other carpet stretchers. Model No. 500 carpet stretcher comes with a space-saving single case design that holds all the components. Crain 500 single case carpet stretcher case has wheels for transport.