0.70Mm Width, 2.0Mm Min Bore, Guhring I.D. Pre-Groove/Chamfering Rh System 104 Insert, 12Mm Reach, Tin Coated 0.70Mm Width, 0.50Mm Depth, 12Mm Reach Gv104.0807.045.12.20.R, 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. 25140 Order Code 4.003 Made In Germany, Guhring Part #9251400040030 Guhring Inc.