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1/2", 0.5in., Round Shank, 90 Degree, Indexable Boring Bar Set, 2627-9104 Round shanks allow the operator to set positive or negative rake Chip breaker eliminates long stringer chips A new cutting edge may be presented by simply indexing the insert It is not necessary to remove tool from chuck or tool post Screw Down Style Positive Rake 90° Lead Uses 0.050" key C6 grade: carbide for steel and alloy steel 1/4" I.C. carbide inserts fit all bars Radius = 0.015” Key = T8 Shank: 1/2" Pieces per set: 4 Set Including the following boring bars: 2627-3020, Shank Dia: 1/2''; Bore Depth: 2-3/4''; Min Bore: 7/16''; Insert: TCMT 21.51; 2627-3022, Shank Dia: 1/2''; Bore Depth: 3-5/8''; Min Bore: 7/16''; Insert: TCMT 21.51; 2627-3024, Shank Dia: 1/2''; Bore Depth: 3''; Min Bore: 1/2''; Insert: TCMT 21.51; 2627-3026, Shank Dia: 1/2''; Bore Depth: 4''; Min Bore: 1/2''; Insert: TCMT 21.51;