1.50Mm Width, 4.0Mm Min Bore, Guhring Rh Straight Groove I.D. System 104 Insert, 17Mm Reach, Tin Coated 1.50Mm Width, 1.00Mm Depth, 17Mm Reach Ge104.0150.000.17.40.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 4.025 Made In Germany, Guhring Part #9251240040250 Guhring Inc.