Abstract: An applicator brush for use in applying various liquids such as nail polish, glue, paste, liquid paper, etc., is designed for securement to bottles of the type having an externally threaded neck portion. A tubular cylindrical member has internal threads dimensioned for engagement with the externally threaded bottle neck portion and additionally is provided with external threads having a pair of axially extending diametrically opposed gaps. A hollow cylindrical cap member has a pair of diametrically opposed radially inwardly extending axially aligned lugs dimensioned for engagement with the external threads of the tubular cylindrical member and for axial sliding movement within the axially extending gaps. An elongated applicator shaft terminating in an applicator brush is secured to the cap member and extends centrally therethrough for insertion into the interior of the bottle.