Specifications: Application scenario: Great for Sofa, Couch, Chair, Ottoman, Furniture, Cabinet, Shelves. Measure: Height: Adjusts from 5.1" to 9.6" Material: Made form Aluminum Alloy material, Electrophoresis black to prevent rust and corrosion Packing included: 4 pcs x Adjustable Height Furniture Leg, 8 pcs x Mounting Screws, 4 pcs supplementary plate Features: 1.This product 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. 2.The design is a cost effective way for maintaining the life of your expensive bedbase / Wooden Slat / Mattress Foundation / Platform Bed Frame / Box Spring .The bed frame support legs will hold and evenly distribute the weight of your heavy mattress efficiently protecting your bed and mattress from sagging and damage .Saving you money on bed repairs and mattress replacements. 3.Made form Aluminum Alloy material, Electrophoresis black to prevent rust and corrosion, ensuring a long life and preventing damage to your bed.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. Tips?Quality Guarantee, If there is any quality problem, please feel free to contact us. Refund or Replacement for any quality problem.