Ceratizit 7872121021 Indexable Boring Bars; Minimum Bore Diameter (Decimal Inch): 1.0000 ; Minimum Bore Diameter (Inch): 1 ; Maximum Bore Depth (Decimal Inch): 2.5000 ; Maximum Bore Depth (Inch): 2-1/2 ; Toolholder Style: SDUCL ; Tool Material: Steel