6mm Min Bore, 52mm Max Reach, GUHRING Boring & Profiling LH System 106 Insert, 0.30mm Radius, Nano-A Coated Left Hand,0.30mm Radius,TiAlN Coated GT106.4757.030.52.60.L.T2, Nano-A Coated Type GT106 Guhring Micro-Precision System 106 Carbide Stick Insert with 6mm Quick Change Shank For Boring & Profiling, 2.00mm (t-max) Offset. Guhring Series No. 25519 Order Code 6.490 Made in Germany, Guhring Part #9255190064900