3.0Mm Min Bore Guhring Boring/Profiling Rh System 104 Insert, 0.55Mm (T-Max) Offset, 12Mm Reach, Uncoated Right Hand, 0.10Mm Radius, Bright Uncoated Gt104.4727.010.12.30.R, Uncoated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25072 Order Code 4.018 Made In Germany, Guhring Part #9250720040180 Guhring Inc.