Material: These furniture leveling screws are made of metal and rubber, more toughness, longevity and corrosion resistance, anti-rust, the screw thread is deep which is not easy to slip while rotating and not easy to fall off. No more scratches: This product has a round base, smooth surface without burrs, exquisite workmanship. Thick base, strong and stable, the round rubber base will not harm or scratch the floor. No Squealing: These leveling feet are a solution for uneven table legs, you can fix them install at the bottom of your product to keep it balanced, also as a bonus sound dampening floor protector mat, your furniture will glide quietly and easily without squeaking. Height Adjustment: Using this product , you can adjust the height of the table and the stool according to your preferences to meet your daily needs. The minimum height is 8mm and the maximum height is 25mm when installed. Package Included: 22 Pack Adjustable Furniture Leg Leveling Feet, The size of this product is M8 x 23 x 27mm.