CrazyMill Cool Z2 is available in three versions of cylindrical (small protection phase of 45°) and toric (corner radius) milling tools in standard milling sizes of diameter 0.3 – 6.35 mm (.0118” – .250”, fractional inches available): a short one for maximum milling depths of up to 1.5 x d, a medium one up to 3 x d and a long one up to 5 x d. The cutting length for all three is 1.5 x d.