Adjustable Size: With adjustable steel poles, Nefish black appliance dolly base can be adjusted from 16 inches to 24-3/8 inches, fit different appliances and furniture. (Note: Pls let The " MIDDLE LINE" sign on the tube remain in the middle position after adjusting the size) Easy to Move: Comes with the locking plastic swivel double-wheels, it can be easily located and stabilized. The mobile roller is made of sturdy PVC pieces and stainless-steel poles, weight limit: 400 lbs Heavier Load Capacity: Compared with other moving rollers, Nefish washing machine pedestal dolly comes with 4 thicken square stainless steel poles. This movable dolly can support appliances or furnitures up to 400 lbs, make it a wide applications, such as washing machine stand, dryer moveing cart, refrigerator base, etc Easy to Assemble: The dolly set includes 4 swivel wheels, each has been installed on premium PVC corner pieces. What you need to do just to install the connecting rod. The dolly can be easily assembled with instruction. No extra tool requirement Premium Quality Control: Nefish will take responsibility for all issues with the product to the end. If you have any problem about the product, pls feel free to tell us, we will reply you within 24 hours.