360 RotationThe mini casters can slide 360, it is completely silent when in use and does not cause any damage to the floor, and the rotation pulleys can be shockproof well.High quality material The casters are made by the strong ABS material and small stainless steel balls, they are both strong and durable which can bear the maximum load of 8kg. storage and shoe boxes, etc.Smooth swivel casters help you move heavy boxes easily.Installation methodJust peel off the film on the back of the casters, then press firmly on the smooth surface.It is better to use 4 stainless steel adhesive rollers to stick to the 4 corners of the bottom of the box. After you stick them, you are recommended to use them after 24 hours.PackageThe package of this product includes 4 casters 360rotation, and each caster is equipped with 1 adhesive sticker. You just need to glue the rotation pulleys to the bottom of the box without the need to plant holes.Size: 4.5*2.8*1.4 from cmPacking list: 1 set (4pcs) *paste swivel wheel