Crafted from high-quality, durable rigid plastic, this set of four adjustable furniture risers provides exceptional support for the heaviest furniture in your home or office, safely holding up to 2000kg (4400 lbs). Unlike other risers, they operate quietly without creaking. The high-density felt bottom glides protect your floors—including hardwood, ceramic, linoleum, and carpet—from scratches and scuffs. The innovative screw clamp design ensures a secure grip that won't slip off, a common issue with other boosters. Simply tighten the screw clip to adjust the fixation, keeping your furniture legs firmly and safely wrapped. These risers are adjustable to fit round or square furniture legs with a width ranging from 22mm (0.8") to 42mm (1.6"). They offer a total height of 134mm (5.3"), with an actual lift height of 103mm (4"). Please note: They are not suitable for slanted furniture legs. Maximize your space by creating valuable storage under beds or providing extra clearance for vacuum cleaners and robotic vacuums to operate more effectively. They also assist older adults by making it easier to get in and out of bed. By adding 100mm of height to beds, sofas, armchairs, tables, and other stationary furniture, these risers can help alleviate shoulder and neck pain caused by furniture that is too low.