CORROSION RESISTANT: the rust and corrosion resistant structure prevents the formation of rust. The hooks of the suction cups are in chromed stainless steel, the cap and knob are in hardened chromed plastic. HOLES: With suction cup technology, the installation of the towel rail becomes extremely simple: just place it on a smooth surface, apply pressure and rotate clockwise. ^ EASY TO USE: it is very convenient to rent an apartment, the people move frequently. Just loosen the suction cup and grab a towel hook. Within minutes, place it in a new location. ^ SUPER SUCTION SYSTEM: Our shower hooks can hold up to 22 lbs. ^ ATTENTION - Suction does not work. does not shine on joints or porous surfaces, such as: wood, porcelain, marble, wallpaper, natural stone such as travertine, painted wall and any surface bumpy surface, etc … < / P>