Ultra Dot HD-Micro Red Dot, Black The all new hd-micro from Ultra Dot is a high quality sight, engineered to give you the smaller size and weight of an open style sight with the strength and durability of a tube UDHD-Micro 28mm tube diameter Don't let its small size fool you. This is one tough sight and is backed by our limited Lifetime Warranty Windage/elevation adjustment range:356 cmat 100M 2 MOA dot size, 10 setting dot brightness adjustment