4.0Mm Min Bore Guhring 45 Deg Chamfer/Bore Lh System 104 Insert, 1.00Mm (T-Max) Offset, 12Mm Reach, Uncoated Left Hand, 0.15Mm Radius, Bright Uncoated Gt104.4537.015.12.40.L, Uncoated Type Gt104 Guhring Micro-Precision System 104 Carbide Stick Insert With 4Mm Quick Change Shank For Boring & Chamfering 45° Both Sides. Guhring Series No. 25121 Order Code 4.009 Made In Germany, Guhring Part #9251210040090 Guhring Inc.