eHemco Christmas Tree Stand (M450) Very easy and simple to set up Christmas and hold the tree for steady. Can also be used for an artificial tree. Make sure to measure the diameter of the tree stump. M450 can hold the tree up to 170"high with 1-1/2" to 6-1/2" Dia. trunk S300 can hold the tree up to 110"high with 1-1/4" to 4-1/4" Dia. trunk Made of Steel frame with Polypropylene cover The lock and unlock mechanism or slider(black button) shown in the third picture