3.0Mm Min Bore Guhring Back-Bore/Profile Rh System 104 Insert, 0.70Mm (T-Max) Offset, 17Mm Reach, Tin Coated Right Hand, 0.10Mm Radius, Tin Coated Gt104.3226.010.17.30.R, Tin Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Back Boring & Profiling. Guhring Series No. 25106 Order Code 4.011 Made In Germany, Guhring Part #9251060040110 Guhring Inc.