Carmex Internal Multiple Threading Insert holder - For Carbide External/Internal Threading Inserts - SR0063C30-4Designed for precision internal threading on CNC milling centers, the Carmex Internal Multiple Threading Insert Holder (SR0063C30 4) brings multi insert efficiency to internal thread milling. Its ideal for shops needing reliable internal threads with lower tooling costs and higher productivity. Multi insert capacity: Holds 48 carbide inserts per holder for aggressive, multi tooth engagement on internal threads. Internal threading focused: Specifically