0.70Mm Width, 3.0Mm Min Bore, Guhring I.D. Pre-Groove/Chamfering Lh System 104 Insert, 7Mm Reach, Tin Coated 0.70Mm Width, 0.70Mm Depth, 7Mm Reach Gv104.0807.045.07.30.L, Tin Coated Type Gv104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Internal Pre-Grooving & 45° Back Chamfering. Guhring Series No. 25141 Order Code 4.005 Made In Germany, Guhring Part #9251410040050 Guhring Inc.