Suitable for stubby towel size.No screws or tools needed.Non slip and non-marking.This unique technology uses dry adhesion film to attach the product firmly to any surface.Once attached it will stay firmly in place indefinately.If it is a non porous surface (glass ,shower walls,mirror) the mounting film can be peeled off any used again and again with no loss of adhesion..For other surfaces there is a special film that permantly attaches the product .Easy to remove product for cleaning.Double coated paint which is rust resistant.3 years warranty.