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