Micro 100 Boring Bar, manufacturer part number QHBBC-050312-004.
Specifications: Minimum Bore Diameter: 0.0500 in; Maximum Bore Depth: 5/16 in (0.3120 in); Shank Diameter: 3/16 in (0.1875 in); Overall Length: 1-1/2 in (1.5000 in); Hand Direction: Right; Neck Diameter: 0.0400 in; Centerline Offset: 0.0250 in; Face Dimension: 1/16 in (0.0630 in); Head Width: 0.0450 in; Length from Holder: 0.5900 in; Corner Radius: 0.0040 in.
Coating/Finish: Uncoated. Unit of measure: Inch.