External turning tool holder for CNMG carbide inserts. This listing covers a single piece tool holder compatible with CNMG carbide inserts (CNMG120404) and constructed from aluminum. Available configurations include MCKNR1616H12, MCKNR2020K12, and MCKNR2525M12, with the MCKNL2525M12 option referenced for the clamping variant. Key benefits Supports CNMG carbide inserts (CNMG120404) for durable, efficient turning with good wear resistance. Aluminum body provides light weight and easy handling, helping reduce machine load and improve heat dissipation during cutting. Rigid external turning configuration promotes stable tool engagement, contributing to consistent cuts and better surface finish. Flexible size options (1616H12, 2020K12, 2525M12) to match different part geometries and cutting depths. Included or compatible clamp variant (MCKNL2525M12) facilitates secure insert seating and straightforward changeovers. Simple, straightforward design aimed at reliable performance in everyday turning tasks without unnecessary complexity. Key attributes Product type: External turning tool holder Insert compatibility: CNMG carbide inserts, CNMG120404 Material: Aluminum Configurations/sizes: MCKNR1616H12, MCKNR2020K12, MCKNR2525M12 Clamp/accessory reference: MCKNL2525M12 Application focus: External turning and related operations using CNMG inserts Applications and use cases Case 1: Finishing and facing aluminum cylinders. Use with CNMG120404 inserts in the MCKNR1616H12 configuration for precise, smooth surface finishes on turned aluminum parts. Case 2: Rough turning and profiling of aluminum profiles. The MCKNR2020K12 configuration provides adequate rigidity and engagement for material removal while maintaining insert life. Case 3: Contour turning and external shaping of aluminum housings or brackets. The larger MCKNR2525M12 option supports deeper passes and stable cutting for complex geometries, with CNMG120404 inserts delivering needed hardness and wear resistance. Notes This description reflects the brandfamily scope and the included model variations as listed: MCKNR1616H12, MCKNR2020K12, MCKNR2525M12, and the referenced MCKNL2525M12. It specifies external turning tool holder use with CNMG120404 carbide inserts and aluminum construction, staying aligned with the provided product title and features.