3.0Mm Min Bore Guhring Boring/Profiling Rh System 104 Insert, .015Mm (T-Max) Offset, 7Mm Reach, Nano-A Coated Right Hand, 0.10Mm Radius, Tialn Coated Gt104.0827.010.07.30.R, Nano-A Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25084 Order Code 4.005 Made In Germany, Guhring Part #9250840040050 Guhring Inc.