Selecting the right insert requires matching the ISO application categories (P for steel, M for stainless steel, K for cast iron). You must evaluate the coating technology, such as CVD (Chemical Vapor Deposition) for heavy-duty turning or PVD (Physical Vapor Deposition) for sharper edges and stainless steel. Additionally, choose a chipbreaker geometry (e.g., -DF for finishing, -DM for general purpose, -DR for roughing) that aligns with your specific depth of cut and feed rate requirements to ensure optimal chip control.