4.0Mm Min Bore Guhring Boring/Profiling Rh System 104 Insert, .015Mm (T-Max) Offset, 17Mm Reach, Tin Coated Right Hand, 0.25Mm Radius, Tin Coated Gt104.0837.025.17.40.R, Tin Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25082 Order Code 4.024 Made In Germany, Guhring Part #9250820040240 Guhring Inc.