BED FRAME SUPPORT LEGS FUNCTION: Queen or king mattresses are heavy, without proper center support, wooden slats or metal bedsteads may be bent or broken. The support legs of the bed frame can provide necessary support for the bed board or bed frame to protect your bed and mattress from sagging and damage. Save your bed maintenance and mattress replacement costs. ADJUSTABLE HEIGHT BED LEGS:The height of the bed support legs is adjustable, and the height can be adjusted by gently turning (adjustment range: 7 "- 13.5"), So it can be used as 7/8/9/10/11/12 inch bed support legs. The length of the top mounting plate of the bed frame leg is 4.3 inches. Note: For the sake of structural stability, we do not recommend that you adjust the bed frame legs to their maximum height. EASY TO INSTALL:When the bed frame has holes:Prepare screwdrivers and wrench,Fix the positions and holes to be installed,Align the screws with the holes and tighten them,Adjust the height by manually rotating the bed support legs. When the bed frame has no holes: Prepare screwdrivers and wrench,Fix the positions and holes to be installed,Align the screws with the holes and tighten them ,Adjust the height by manually rotating the bed support legs. STURDY MATERRIAL: Made form high quality steel, The surface is frostedwhich has the characteristics of strong and durable / not easy to deform / strong bearing capacity / not easy to rust. we have thickened the pipe wall to make it more load-bearing. Leg bottom PVC pad are non-slip and wear resistant, won't be harm and scratches to your floors and it has better grip. HARDWARE INCLUDED: 2 pcs Height Adjustable from 7" to 13.5" Adjustable Height Center Support Leg,4pcs 2.48"screw，2pcs supplementary plate. If you find the product is damaged or missing parts, please contact us for a free replacement. Specifications: Application: This bed frame feet replacements is designed to match different beds' heights to protect your bed and mattress from damage or sagging，Saving you money on bed repairs and mattress replacements. The bed frame legs replacement is suitable for bed frame, bed center slat、Sofa Furniture Cabine and other furniture. Height: Adjusts from 7 inch to 13.5 inch Easy to install: lf the bed frame has holes,align the double holes with the bracket and tighten the screw. If the bed frame has no holes, clamp the bed frame with bracket and auxiliary plate and tighten the screws. More durable: Made form high quality steel, The surface is frostedwhich has the characteristics of strong and durable / not easy to deform / strong bearing capacity / not easy to rust. we have thickened the pipe wall to make it more load-bearing. Leg bottom PVC pad are non-slip and wear resistant, won't be harm and scratches to your floors and it has better grip.