A square-shaped indexable carbide insert with positive-rake AFSN finishing geometry, designed to screw-clamp into the pockets of a 45° square shoulder face mill body such as the KM12R.Key specs ISO insert code: SEHT1204AFSN Material: Carbide Chip breaker/geometry: AFSN -- positive rake, general-purpose finishing geometry (45° square shoulder face mill insert, screw-clamped) Application / use caseThe AFSN geometry's flat-bottom, positive-rake cutting edge is suited to finishing passes on face-milled surfaces, producing a smooth flat finish on squared-up stock rather than heavy roughing cuts. Each insert has multiple usable corners, so it can be indexed to a fresh edge as one wears before the whole insert needs replacing, and it's sold as a 10-pack to keep a full set of cutting edges on hand for the SEHT1204AFSN-compatible face mill body.