Easy Installation:For with pre-drilled holes,align the bed frame legs' holes with the 2 holes on the bed frame and tighten the bolts and nuts. Without holes,position the support leg and auxiliary plate to clamp the frame,then secure with bolts.For wooden frames, you can secure support leg by driving the provided nails into the bed frame Adjustable Height: The height of the bed support legs is adjustable by simply rotating the base. The unadjusted original height of the bed support leg is 7.8 inches and it can be extended to a maximum of 13 inches. Please check the size information before purchasing, make sure the size is exactly what you need Multi-Scenario Usage: The bed frame support legs provide essential support to your bed slats or frame, preventing bending, sagging, and breakage caused by heavy mattresses or active use. Also can adjust the height of the bed to save spaces. For a cleaner aesthetic, we recommend positioning the legs inward, keeping them concealed beneath the bed Premium Material: The adjustable height bed support legs are crafted from high hardness plastic material.A single leg can support up to 600 lbs.The bed frame support legs is in weight,waterproof, rust-proof,wear- and not easy to damage or scratch the floor.The thickened design enhances stability, providing long lasting and reliable Packing List: 7.8-13 inches adjustable bed legs*4, mounting auxiliary plate*4, bolts*8, hexagonal nuts*8, screws*16. After adjusting the height, securely tighten the fixing ring to stabilize the bed frame support leg. To prevent sliding, you can add some grip tape to the bottom of the bed support legs