3 Piece 1/2" Square Shoulder Indexable End Mill Set ~ 90° square shoulder. ~ Used for slotting and peripheral milling. ~ Excellent alternative to high speed steel, cobalt and carbide end mills for heavy material removal rates. ~ Uses standard APKT-1003 (#6010-4203) inserts with M2.5 X 6mm (#2100-0070) screw. ~ Inserts are not included.