Trailer Jack with great features.For use on trailor tongues up to 3" x 5"10" of vertical travel provides up to 21" of lift.Reinforced wheel fork, zinc plated tube, solid cast gears and a two pin swing-up release for added strength. The handle gear shaft is flat on one side along with the gear itself making a positive connection - eliminating the need for a roll pin. (Common weakness on other jacks).