M4 X .70Mm Pitch Partial Profile Guhring I.D. Thread Lh System 104 Insert, 17Mm Reach, Uncoated M4.0, 0.70Mm Pitch, 17Mm Reach Gg104.Tm04.070.17.33.L, Uncoated Type Gg104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Partial Profile Metric Threads. Guhring Series No. 25155 Order Code 4.009 Made In Germany, Guhring Part #9251550040090 Guhring Inc.