0.79Mm Width, 4.0Mm Min Bore, Guhring Rh Straight Groove I.D. System 104 Insert, 17Mm Reach, Uncoated 0.79Mm Width, 1.00Mm Depth, 17Mm Reach Ge104.0079.000.17.40.R, Uncoated Type Ge104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Internal Grooving Straight Slots. Guhring Series No. 25130 Order Code 4.015 Made In Germany, Guhring Part #9251300040150 Guhring Inc.