4.0Mm Min Bore Guhring Boring/Profiling Rh System 104 Insert, 0.30Mm (T-Max) Offset, 22Mm Reach, Tin Coated Right Hand, 0.15Mm Radius, Tin Coated Gt104.2037.015.22.40.R, Tin Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25074 Order Code 4.020 Made In Germany, Guhring Part #9250740040200 Guhring Inc.