BUILT-IN STRONG GLUE: Load capacity up to 5kg, offering higher adhesion 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. Resistant to water vapor and moisture, making it suitable for use in bathrooms and other damp 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 adhesive membrane has memory retention. When changing installation locations, simply rinse the suction cup under tap water and let it dry completely before reuse. VERSATILE APPLICATION: Ideal for use on drawers, hooks, and various hanging needs. Compatible with glazed ceramic tiles, glass mirrors, patterned tiles, frosted glass, lacquered wood surfaces, and other smooth or slightly uneven surfaces with convexity under 1mm. SPECIFICATIONS: Material: ABS Suction Cup Diameter: 6.4 cm Dimensions: 6.4 x 6.4 x 5 cm Package Includes: Glass Door Knobs