Achteck has a complete line-up of grades and chip-breakers that are hard to beat.  
It covers a wide range of grades as  follows ;

(STEEL) P – AC150P, AC200P, AC250P, AC350P, AT202
(STAINLESS STEEL) M – AP301M, AP200M, AP100S
(COAT IRON) K – AC102K, AC202K,AC150K
(NON FERROUS) N – AW100K
(SUPER ALLOYS) S – AP100S