Din311 Bridge Reamer High speed steel,HSSCobalt. DIN311. Size:7/16" to 2",8mm-30mm. Tolerance: H7,H8. Bridge Reamers.High Speed ... for use in structural steel, in the building industry, bridge erection, and ship construction. The cutting end of the ... very badly misaligned holes. Bridge Reamers are commonly used in portable electric or pneumatic machines Din311 Bridge Reamer high speed steel HSSCobalt