Comes Complete With Adjustable Locking Power Head, Auto-lok Tube, 3 Extension Tube Sections, 1 Transfer Tube Section. Adjusts From 37" To 23 Ft. And Can Be Lengthened By Adding Additional Extension Tubes. Adjusting Knob On The Top Of The Power Unit With A Visual Depth Setting Gauge. Just Set The Dial To The Desired Pin Depth And You're Ready To Stretch.