Free SplicingOne set of two trolly ,used for moving furniture, labor-savingFree your handsfor easy handling and less effort than you might think. A small body can make a big difference.Super sturdy and easy to use. Very useful for carrying heavy things Infinite Extension According to the size of the object, the size of the chain plate can be increased up and down, left and right. Stackable for storage, slotted in place and secure