KARRYTON 23" Ladder Levelers for Type II,I and IA Extension Ladders up to 32',with Anti-Slip Threaded and Adjustable Extension Ladder Legs for Stairs and All Surfaces - Extented Version(23") - - Amazon.com
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Ladder Leveler for Extension Ladders Stabilizer Ladder Leg Leveling Tool 330 LBS | eBay
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KARRYTON Ladder Levelers for Type II,I and IA Extension Ladders up to 32',with Anti-Slip Threaded and Adjustable Extension Ladder Legs for Stairs and All Surfaces - Pair (Standard Version (20")) - -