3/4" Shank Diameter: Designed for robust boring operations, fitting a wide array of lathe machines with a 3/4" tool holder. Dual TCMT Inserts: Includes TCMT 21.5 and TCMT 22 carbide inserts, ideal for precision machining on steel and alloy steel. Enhanced Chip Control: Features a chip breaker design to prevent long stringer chip formation, ensuring a cleaner working environment. Easy Indexing for New Edges: Allows quick, efficient indexing of inserts to present a new cutting edge without removing the tool from the machine. Comprehensive Set: 8-piece set covering overall lengths from 3-3/8" to 5-1/2", bore depths of 1-3/8" to 3-1/2", and minimum bores from 7/16" to 11/16". Key: T8. 8pc extra screws. In a fitted aluminum case.