GTK-12M 12-16A GTK-12M 2,5-4A GTK-12M 4-6A GTK-12M 5-8A GTK-12M 6-9A GTK-12M 7-10A GTK-12M 9-13A GTK-12M-0.16 GTK-12M-0.25 GTK-12M-0.4