The PK70-1CA LeveLok Ladder Leveler is used to level ladders on uneven surfaces. It comes with two (2) base units that stay attached to the ladder. The Leveler can be used on either side of the ladder and can be easily removed when not in use. It has a swivel shoe with ice picks on both ends. It can be adjusted up to 8-1/2 in and comes with mounting hardware and instructions.