2.0Mm Min Bore Guhring Boring/Profiling Lh System 104 Insert, 0.35Mm (T-Max) Offset, 4Mm Reach, Uncoated Left Hand, 0.05Mm Radius, Bright Uncoated Gt104.4717.005.04.20.L, Uncoated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25073 Order Code 4.001 Made In Germany, Guhring Part #9250730040010 Guhring Inc.