CrazyMill Cool Ball Z2 is available in three versions and in standard milling sizes of diameter 0.3 – 8 mm (.0118” - .315”, fractional inches available): a short one (type A) for maximum milling depths of up to 2 x d, a medium one (type B) up to 3 x d and a long one (type C) up to 5 x d. The cutting length for all three is
2 x d.