... carbide inserts of large diameters and high projection.3)This cutting structure design, combined with maximum ... Bearing Structure Air cooling roller bearing package. Balls lock the conewhich reduces the probability of cone-dropping ... Balls lock the cone which reduces the probability of cone Cdropping to minimum.Main Type AvailableSize: 2 3/8",3",3 5/8:",3 ... 7/8",4",4 1/2",4 5/8",4 3/4", ...