0.70Mm Width, 3.0Mm Min Bore, Guhring Rh Straight Groove I.D. System 104 Insert, 7Mm Reach, Tin Coated 0.70Mm Width, 0.70Mm Depth, 7Mm Reach Ge104.0070.000.07.30.R, 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. 25124 Order Code 4.010 Made In Germany, Guhring Part #9251240040100 Guhring Inc.