Grade 370 is for cutting steel. Made in USA. AR cuts right hand to a square shoulder. AL cuts left hand to a square shoulder. BR cuts right hand with a 15 degree lead angle. BL cuts left hand with a 15 degree lead angle. C is square nose for chamfering, facing, and turning. D has 80 degree point for undercutting, ID and Outside Diameter chamfering. E has 60 degree point for threading.