Ammco, Alltool, Hoffman, Hunter, Performance, Rels Negative Rake Bits, 10 bits, 6 cutting edges Fits Ammco 1000, 2000, 3000, 4000, 4100, 7000, Hunter Model #BL300, Performance Model# 66, 6600, 7100, 7200, 7600,; RELS 2000 w/ negative rake tool holder