Professional Palette Holder for Extensions. Lash Holder is an indispensable accessory for professionals who want to work comfortably, cleanly, quickly and neatly. It allows you to carry out extension treatments and avoid wasting eyelashes and strips by remaining protected in this holder with transparent acrylic lid. Lash Holder is not only a support for extension strips. It is a sturdy acrylic case to store the extension strips for use. This is an essential application tool to take care of extensions once they are removed from their box.