Crain 520 Swivel-Lock Carpet Power Stretcher gives you the benefits of both straight and swivel power stretcher head. The head has 60° of free swivel for patterned carpet. Depress the built-in lock pin, and you can lock the swivel in 5 convenient positions. Lock in the straight position for square stretching, or at 15° for most angle stretching. There’s even a 30° setting for extreme angles found in “L” shaped living/dining rooms. Also features a stretch lock button for partial stretches. Pin depth adjustment bar allows for variable pin depth penetration for different carpet thicknesses. Adjusts with two screws in the pin plate. Comes with Auto-Lok Tube, 3 extension tubes, transfer tube, and folding tail block. Adjusts from 37 inches to 23 feet and can be lengthened with additional tubes. Available in double case model only.