Micro 100 Boring Bar, manufacturer part number BB-4902500S.
Specifications: Minimum Bore Diameter: 0.5100 in; Maximum Bore Depth: 2-1/2 in (2.5000 in); Shank Diameter: 1/2 in (0.5000 in); Overall Length: 4.0000 in; Hand Direction: Right; Neck Diameter: 0.3680 in; Centerline Offset: 0.2400 in; Face Dimension: 1/4 in (0.2500 in); Projection: 0.1220 in; Tooth Width: 0.3000 in; Split Length: 0.3200 in.
Coating/Finish: Uncoated. Unit of measure: Inch.