4.0Mm Min Bore Guhring 45 Deg Chamfer/Bore Lh System 104 Insert, 1.00Mm (T-Max) Offset, 27Mm Reach, Nano-A Coated Left Hand, 0.15Mm Radius, Tialn Coated Gt104.4537.015.27.40.L, Nano-A Coated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Chamfering 45° Both Sides. Guhring Series No. 25117 Order Code 4.012 Made In Germany, Guhring Part #9251170040120 Guhring Inc.