NIUNIU 360 FREE ROTATION: You need to paste the universal wheel at the bottom of the box, then this heavy box can easily and steadily move in any direction, saving time and effort. EASY TO INSTALL: You need to use the self- locking device that comes with it. You just need to stick the casters to the bottom of the object with the included self- adhesive tape. No drilling is required and there is to the object. recommended to wait 24 hours, it will stick more firmly. WIDE RANGE OF APPLICATION: The casters are suitable for trash cans, storage boxes, small furniture, laptops, machines or other objects that need to be moved more easily. QUALITY AND SAFETY: Mini casters are made of material. Mini casters are made of and stainless steel materials to ensure that they are, quiet and smooth, easy to roll, non- toxic and odorless. Delivery Quantity: 10pcs Package Contents: Only the above package contents, excluding other products. Size: 4.5*2.6cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)