Fit these necks to you perfume/beauty glass bottle projects.These necks will match these respective industry standard caps or dispensers/pumps :14/41518/40020/41020/41524/415Ready for 3d printing and/or CAD for industrial mould making. AVAILABLE FORMATS : .stl .obj .iges .stepI am a pro industrial designer in perfume/beauty, feel free to reach out to me if you need help !