These ends hold two metal rods over a basin or sink (adjustable). A glass microscope slide rests across the rods for staining or washing. This is used in biology to stain sectioned biological tissues or cytologic preparations.I coated them with "Flex-seal" to rubberize the ABS plastic parts (to protect them from solvent chemicals).Designed in trueSpace and printed on an Up3D.Download both parts Horiz and virt. One fits in the other and can be glued in place.I coated them with flex-seal to rubberize the parts to protect them from solvent chemicals.