The AeroCreeper is an adjustable-height mechanics creeper that is used to maintain, wash, or work under aircraft, boats, tractors, or industrial equipment. It is designed to be simple to operate and mainenance free. Simply adjust the creeper to the desired height before getting on (you must be off the creeper to adjust it). ​ To raise, lift the backrest to the desired height - it will automatically lock into position. To lower, simply lift the handle under the seat while holding the back rest with your other hand. Lower the seat to the desired position then let go of the handle while still holding the backrest with your other hand. The seat will automatically lock into position. This creeper has a 2-position seat. To tip the seat, simply lift it up until it locks in the tipped position. To return it to position1, lift the lever under the seat.