1UPGRADE PART: Standard hole diameter, compatible with most walkers, transform the walker into a rolling walker, help the elderly walk more easily and with less effort. 2UNIVERSAL WHEELS: Plastic wheels with universal rotation, suitable for tile, concrete, wood, carpet and other surfaces, won't leave marks or scratch the floor. 3EASY TO INSTALL: A total of 2pcs walker wheels are included, easy to install, no extra tools needed, just remove the lower part of the front leg of the walker and install this wheel. 4ADJUSTABLE HEIGHT: Seniors walker wheels are height adjustable, support 5 gears height adjustable, with locking fixed hole diameter, stable and reliable use. 5STABLE AND DURABLE: This walker caster wheel is made of premium aluminum alloy legs, sturdy and durable, no deformation, strong load bearing capacity. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.