Micro 100 Boring Bar, manufacturer part number PR-3601250X.
Specifications: Minimum Bore Diameter: 0.3820 in; Maximum Bore Depth: 1-1/4 in (1.2500 in); Shank Diameter: 3/8 in (0.3750 in); Overall Length: 2-1/2 in (2.5000 in); Hand Direction: Right; Neck Diameter: 0.2300 in; Centerline Offset: 0.1725 in; Projection: 0.1300 in; Tooth Width: 7/64 in (0.1090 in); Corner Radius: 0.0080 in.
Coating/Finish: AlTiN. Unit of measure: Inch.