Attributes . Flat lapping: 2, 4, 8 uin Reaming: 16, 32, 63 uin Plain grinding: 2, 4, 8, 16, 32, 63 uin Horizontal milling:16, 32, 63, 125, 250, 500 uin Vertical milling: 16, 32, 63, 125, 250, 500 uin Turning: 16, 32, 63, 125, 250, 500 uin . Names