Features: 1. STURDY STEEL MATERIAL: Adjustable furniture risers made of heavy-duty solid carbon steel, designed to support the weight of heavy furniture in homes or offices. Resistant to cracking. 2. SCREW-CLAMP SECURE MOUNTING: Features a screw-clamp design that securely wraps around furniture legs to prevent slipping or falling. Suitable for sofas, couches, tables, and desks. Easy to install. 3. ADJUSTABLE WIDTH: Width adjusts from 1 cm to 3.7 cm; provides height increases of 5 cm or 10 cm. 4. ADDITIONAL HEIGHT BENEFITS: Increases under-bed storage space and improves vacuum cleaner or robot vacuum access. Also enhances accessibility for seniors getting in and out of bed. 5. FLOOR PROTECTION: Smooth, heavy-duty edges help prevent dents, scratches, or scuffs on hardwood, ceramic tile, and linoleum floors. Specifications: Material: Carbon Steel Color: Black, Brown Height Options: 5 cm, 10 cm Weight: 180 g, 305 g, 360 g, 610 g (varies by size) Package Includes: 2 or 4 adjustable furniture risers