DVQNR & DVVNR External Turning Tool Holders. Compatible inserts: VNMG, VNMA diamond 35° sharp-point inserts. Mainly used for external finishing, profile turning, arc chamfering, curved & tapered surface finishing and corner cleaning. Suitable for machining steel, stainless steel, cast iron, non-ferrous metals and titanium alloy. Ideal for mold steel, complex curved surfaces, precision shafts and high-gloss finish with minimal interference; applicable to CNC lathes and turning centers.