Reed Shell Cutter, Heavy Duty, For Use With: Feed Tap™ Drilling Machine, 1-3/4 in Shell. Heavy-duty shell cutter fits most standard arbors and competitive machines. Recommended for cast iron and ductile iron. Teeth have carbide inserts which outlast bi-metal teeth. Reed FTSC1750 Heavy Duty Shell Cutter, 1-3/4 in Shell, For Use With: Feed Tap™ Drilling Machine