BUILT-IN STRONG GLUE: Load capacity up to 5kg, offering higher adsorption power than conventional suction cups. The suction cup features a vacuum locking ring that effectively prevents air pressure from loosening the hold, ensuring a firm and secure vacuum seal. NO DRILLING REQUIRED: Installs in just five seconds by placing it on the surface and pressing the safety lock switch. Not affected by water vapor or damp walls, making it suitable for use in bathrooms and other humid environments. PREMIUM QUALITY: Made of high-quality ABS material, durable, lightweight, and portable. Designed for long-term use with reliable strength and stability. LONG-LASTING PERFORMANCE: The adsorption membrane has memory retention. If relocating, simply rinse under tap water, allow to dry completely, and reuse. VERSATILE APPLICATION: Suitable for drawers, hooks, and various hanging needs. Works well on glazed ceramic tiles, glass mirrors, patterned tiles, frosted glass, lacquered wood surfaces, and other smooth or slightly uneven surfaces with curvature less than 1mm. SPECIFICATIONS: Material: ABS Suction Cup Diameter: 6.4 cm Dimensions: 6.4 x 6.4 x 5 cm Package Includes: Glass Door Knobs