Mini Hollolith 450mm. The slate mini hollolith is generally a 450-600mm high piece of slate in mixed tones of either plum, grey or blue. It comes with a sawn base, a large diameter bore hole through the front and a 32mm hole drilled from the base for water. When used as a water feature it will go well with our Water Feature Kit (sold separately) and can provide a nice interesting piece which comes alive with water running through. It is just at home as a stand alone piece without water as a modern, contemporary stone. The weight can be between 10-20kg.