Powerful suction for a deep vacuum. Designed to make it safe for you in the bathroom or elsewhere. Please note that this suction clamp is only for use on non-porous surfaces, such as smooth tile, glass, porcelain, or fiberglass, and should not be used on rough or uneven surfaces. Simple to use: Release levers make it easy to installation and removal of the grab bars, no drilling or tools required please do the test to avoid risk Number of shipments:2 pcs