The TeleLock® collar has an internal friction mechanism with three settings.  In the "RAISE" setting, the mechanism grips and holds the tube, allowing you to incrementally pull the center tube up to the required height.  In the "LOCK" position, the collar has extra security.  In the "LOWER" setting, TeleLock® eases off and assists lowering the center tube.  This unique design safely takes the strain off you!

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