4.0Mm Min Bore Guhring Boring/Profiling Lh System 104 Insert, 0.30Mm (T-Max) Offset, 17Mm Reach, Tin Coated Left Hand, 0.05Mm Radius, Tin Coated Gt104.2037.005.17.40.L, Tin Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25075 Order Code 4.014 Made In Germany, Guhring Part #9250750040140 Guhring Inc.