0.79Mm Width, 4.0Mm Min Bore, Guhring Lh Straight Groove I.D. System 104 Insert, 17Mm Reach, Tin Coated 0.79Mm Width, 1.00Mm Depth, 17Mm Reach Ge104.0079.000.17.40.L, Tin Coated Type Ge104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Internal Grooving Straight Slots. Guhring Series No. 25125 Order Code 4.015 Made In Germany, Guhring Part #9251250040150 Guhring Inc.