Ingersoll 0.591, 15.0mm QR Series Quad Twist Drill for Square Inserts, 3210689
Ingersoll 0.591, 15.0mm QR Series Quad Twist Drill for Square Inserts, 3210689. Ingersoll Quad Twist Square Insert Indexable Drills for SOMT style inserts. Features 4-cornered economical insert design. Improved machinability due to ideally configured cutting edge. New extended length shanks (R02). RO2 allows two set screw contact for lathe applications and cut-off notch added for ease of shortening in rotating applications.