This is a 4 piece kit that comes with 2 extension legs w/wheels and 2 extension legs with tips allowing replacement for all 4 corners of the walker in one item Allows for height adjustments from 36 to 43 (walker handgrip to floor). (Adds 4 to height of walker) 5 rubber wheel allows walker to roll easily and smoothly over irregular surfaces For use with all Drive and most leading manufactures walkers Includes rear glide caps (item #1085A) and glide covers (item #1085C) allowing use on all surfacesi 350 lb. Weight Capacity