Somta Series 163 – 3.4MM UDL Stub Drill HSS Co5 Carmex Internal ISO Threadmill Insert 30mm 3.5mm ✔ Thread Size: 1 1 8" UNC Haron TRS12 ✔ Thread Size: 1 1 8" UNC (Unified National Coarse)✔ Standard: ISO 529✔ Material: High Speed Steel (HSS) for enhanced strength and wear resistance✔ Thread Form: 60° flank angle for precision and secure thread cutting✔ Tolerance Class: ISO 2 (2B) for a standard thread fit✔ Flute Type: Straight flute for effective chip removal✔ Lead Type: Intermediate lead for balanced cutting performance✔ Cutting Direction: Right hand cutting✔ Application: General purpose threading across various materials accurate thickness checks across a wide range of materials Stub length design for enhanced rigidity and reduced deflection Suitable for a variety of materials including steel and aluminum