Ammco Style Round Positive rake cutting bits for Disc/Drum Lathes. Replaces all Ammco 940610 bits and has hash marks for easy location during bit rotation. Use On Ammco Models 3850, 4000, 7,000 and 7500 Brake Lathes. Bit has 15-20 cutting edges when indexed. Also for use on All Tool, RELS, Snap-On and Performance brake lathes with a change out of the toolholder. Use with Shark #426 and 427 toolholders. Ammco Style Round, Positive Rake Inserts have 15-20 Cutting Edges. For use in place of OEM# 940610.