For sale are these 3 pcs of a CORO CUT MB SANDVIK MB-09FB100-00-14L Face groove Carbide Inserts, Grade 1025, .040" wide with about a 0 nose radii.
MSC sells these for about 66 each, but they want you to buy 10. Save some $'s here

MSC says;

Grooving Insert: MB09FB100-00-14L 1025, Carbide