PACKING LIST: adjustable bed legs(7.08 inch-12.6 inch) X 4, bolts(2.36 inch long) X 8, Hexagonal nuts X 8, mounting auxiliary plate X 4; To reduce unnecessary hassle, please check the size information before purchasing ADJUSTABLE BED SUPPORT LEGS: the height of this bed legs can be adjusted with the swivel base to select the right height to suit uneven floors; The unadjusted original height is 7.08 inch (18 cm), maximum total height can be adjusted to 12.6 inch (32 cm); Please check the size information before you buy to make sure the size is exactly what you need BED LEGS ROLE: some mattresses are so heavy that without proper center support, they may cause the bed slats or metal bed frames to bend or break; This bed center support legs adds the necessary support to your bed slats or bed frame, effectively protecting your bed base/ wooden slats/ platform bed frame from sagging and damage; save you money on bed repair and replacement UPGRADE FEET BASE: the base of our bed legs is