CoroMill® QD High-security groove milling and parting off CoroMill® QD is the first choice for narrow, deep grooves. Internal coolant combined with optimized insert geometries deforming the chip to a shape narrower than the groove. Application — Deep grooving and parting off — External and internal machining — Roughing to finishing Features and benefits ISO application areas — Secure machining ensured by excellent chip evacuation and long and predictable insert and cutter-body tool life — Internal coolant — High-quality grooves with close hole tolerances — Easy insert changes for efficient production First choice for narrow, deep grooves Built for precision in deep and narrow grooves, this solution combines internal coolant with chip-narrowing geometries for secure, efficient machining. Expect excellent chip control, long tool life and high-quality results every time. 299