Stronger: Unibody Construction Allows You to Add Essential Support to Wooden Slats or Bed Frame, Protecting Your Bed and Mattress From Sagging and Damage. No Need to Down Grade Your Mattress or Give Up The Bed Frame You Love. Note: This Product Only Has Support Legs, Shown In Picture to Only Demonstrate Where to Attach. The Unibody Is Meant to Attach to The Slats of Your Current Bed Frame In order to Prevent Sagging, Bowing, or Cracking. Sizethe Slatjack Slat Support Legs Is Height Adjustable From 7.08 to 13.38.The Large Size Helps Prevent Carpet and Hard Floor Damage. Do Not Worry About Damage or Scratches to Your Beautiful Hardwood Floors. The Unibody Will Hold and Evenly Distribute The Weight of Your Heavy Mattress Efficiently. Saving You Money On Bed Repairs and Mattress Replacements. The Unibody Is A Cost Effective Way For Maintaining The Life of Your Expensive Bed Frame and Mattress. Hardware Included: 2Pcs Height Adjustable From 7.08 to 13.38 Adjustable Height Center Support Leg,4Pcs 2.48Screw2Pcs Supplementaryplate. No Extra Trips to The Hardware Store. Improve The Quality of Your Sleep: If You Think That A Sagging Mattress Would Not Affect Your Sleep, You Might Want to Think Again In Fact, without Proper Center Support, The Weight of The Mattress Will Bow or Crack The Wooden Slats, Causing Them to Slide or Even Worse, Squeak While Youre Trying to Sleep What Is More, The Uneven Feel of The Mattress Itself Can Significantly Affect Your Spine, Causing Serious DiscomFor t During Both Sleep and Waking Hours. Made For m Aluminum Alloy Material, Anti-Corrosive and Will Not Rust, We Have Thickened The Pipe Wall to Make It More Load-Bearing Leg Bottom Pvc Pad Are Non-Slip and Wear Resistant.