Micro 100 Boring Bar, manufacturer part number BB-290500X.
Specifications: Minimum Bore Diameter: 0.3100 in; Maximum Bore Depth: 1/2 in (0.5000 in); Shank Diameter: 5/16 in (0.3125 in); Overall Length: 2-1/2 in (2.5000 in); Hand Direction: Right; Neck Diameter: 7/32 in (0.2180 in); Centerline Offset: 0.1338 in; Face Dimension: 5/32 in (0.1560 in); Projection: 0.0720 in; Tooth Width: 0.2000 in; Split Length: 0.2200 in; Corner Radius: 0.0060 in.
Coating/Finish: AlTiN. Unit of measure: Inch.