0.50Mm Width, 2.0Mm Min Bore, Guhring Lh Straight Groove I.D. System 104 Insert, 12Mm Reach, Uncoated 0.50Mm Width, 0.50Mm Depth, 12Mm Reach Ge104.0050.000.12.20.L, Uncoated Type Ge104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Internal Grooving Straight Slots. Guhring Series No. 25131 Order Code 4.008 Made In Germany, Guhring Part #9251310040080 Guhring Inc.