Have extra-large version ordered, because we like to take blue spruce as a Christmas tree. These have to under a very thick trunk. In these stand neatly fits what pure. Very easy installation and alignment of the tree. Just below the center of the trunk a 6-8mm large bore drill approx 30-40mm deep. This hole simply move into the centering of the projects from the floor stand, align tree and clamp with the ingenious clamping mechanism. Large volume of water with level control. Through the use of the water of the tree needling much less. Due to its size very stable. Highly recommended.