Adjustable from 7inch-13.5inch (18cm - 33cm). The bed frame center support legs are designed to match different bed heights to protect your from damage or sagging. The bed frame support legs are made of aluminum alloy, which is - and not rust or deform. High load capacity with individual weight capacity up to 250 lbs per leg. The bottom of the legs is equipped with PVC pads, which are non-slip and not easy to damage the floor. Easy to install, T-shaped feet, no drilling required, easy to install. When the bed frame has holes, directly use the bracket to align the double holes, put the screws to adjust the distance, and then tighten it. If the bed frame has no holes, clamp the bed frame with the bed frame legs and auxiliary boards and tighten the screws. Colour:black Material:Metal Package Contents: 2x adjustable bed legs 4x screw rod 4x nuts 2x mounting plate Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.