3 Piece 82 Degree Indexable Countersink & Chamfer Tool Set ~ Use for deburring and countersinking large diameter holes. ~ Positive rake for smooth cutting without chatter. ~ Carbide indexable so no tool resharpening is needed. ~ Includes 1 each of 1/4 X 3/4 X 1/2" shank, 1/2 X 1-3/4 X 1/2" shank, 1-1/4 X 2-1/2 X 3/4" shank, C-5 inserts & L-hex keys. ~ Replacement inserts are 6025-1321 and 2001-0023. ~ Replacement screws are #2100-0003 for the triangle insert (TPGH 321) and #2100-0076 (SPGH 433) for the square inserts.