... ,HSSCobalt. DIN311. Size:7/16" to 2",8mm-30mm. Tolerance: H7,H8. Bridge Reamers.High Speed SteelTaper Shank, Long Body.Straight ... : DIN311, ISO2238.Size:7/16" to 2",8mm-30mm.Tolerance: H7,H8.Bridge Reamers are designed for use in structural steel ...