8 Piece 3/4" Round Shank Indexable Boring Bar Set ~ Uses TCMT21-51 Inserts ~ Positive Rake 90° Lead ~ 7° Relief ~ Torx Wrench T-8 Included ~ M2.5 Screws ~ Includes the following sizes: 7/16" Minimum Bore X 3-3/8" Overall Length X 1-3/8" Bore Depth, 7/16" Minimum Bore X 4-1/4" Overall Length X 2-1/4" Bore Depth, 1/2" Minimum Bore X 3-5/8" Overall Length X 1-5/8" Bore Depth, 1/2" Minimum Bore X 4-5/8" Overall Length X 2-5/8" Bore Depth, 9/16" Minimum Bore X 3-7/8" Overall Length X 1-7/8" Bore Depth, 9/16" Minimum Bore X 5" Overall Length X 3" Bore Depth, 11/16" Minimum Bore X 4-1/4" Overall Length X 2-1/4" Bore Depth and 11/16" Minimum Bore X 5-1/2" Overall Length X 3-1/2" Bore Depth.