1.00Mm Width, 4.0Mm Min Bore, Guhring I.D. Pre-Groove/Chamfering Rh System 104 Insert, 17Mm Reach, Uncoated 1.00Mm Width, 1.00Mm Depth, 17Mm Reach Gv104.0810.045.17.40.R, Uncoated Type Gv104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Internal Pre-Grooving & 45° Back Chamfering. Guhring Series No. 25146 Order Code 4.010 Made In Germany, Guhring Part #9251460040100 Guhring Inc.