Micro 100 Boring Bar, manufacturer part number HBBC-3601000-004.
Specifications: Minimum Bore Diameter: 0.3600 in; Maximum Bore Depth: 1.0000 in; Shank Diameter: 3/8 in (0.3750 in); Overall Length: 2-1/2 in (2.5000 in); Hand Direction: Right; Neck Diameter: 0.3200 in; Centerline Offset: 0.1800 in; Face Dimension: 3/16 in (0.1880 in); Head Width: 0.3400 in; Corner Radius: 0.0040 in.
Coating/Finish: Uncoated. Unit of measure: Inch.