Ammco 7681 Positive Rake Carbide replacement bits. 10 piece, with screws. OEM# 7681 Positive Rake. Ammco models 3850, 6900, 6950, twin cutters Performance models 6600, 7100, 7200, 7600 Please check out our other Brake Lathe products, Thank You. Free Shipping, Same day before 12pm PST.