Indexable Milling Insert Lead Angle 0 Degrees Insert Shape Square N331.1D Chip-Breaker PM Grade 4230 Inscribed Circle 0.512 In. Insert Thickness 0.258 In. No of Edges 8 Mounting Hole Dia 0.171 In. Nose Radius 0.047 In. Coating MTCVD Rake Negative Cutting Direction Neutral Mounting Style Screw Clamp Workpiece Material Steel Application Milling