4.0Mm Min Bore Guhring Boring/Profiling Rh System 104 Insert, .015Mm (T-Max) Offset, 32Mm Reach, Uncoated Right Hand, 0.15Mm Radius, Bright Uncoated Gt104.0837.015.32.40.R, Uncoated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Profiling. Guhring Series No. 25088 Order Code 4.022 Made In Germany, Guhring Part #9250880040220 Guhring Inc.