3.0Mm Min Bore Guhring Boring/Profiling Lh System 104 Insert, .015Mm (T-Max) Offset, 7Mm Reach, Uncoated Left Hand, 0.05Mm Radius, Bright Uncoated Gt104.0827.005.07.30.L, Uncoated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25089 Order Code 4.001 Made In Germany, Guhring Part #9250890040010 Guhring Inc.