Micro 100 Boring Bar, manufacturer part number QBB3-050150.
Specifications: Minimum Bore Diameter: 0.0550 in (1.40 mm); Maximum Bore Depth: 0.1500 in; Shank Diameter: 3/16 in (0.1875 in); Overall Length: 1-1/2 in (1.5000 in); Hand Direction: Right; Neck Diameter: 0.0370 in; Centerline Offset: -0.0438 in; Projection: 0.0130 in; Length from Holder: 0.5900 in; Corner Radius: 0.0030 in.
Coating/Finish: Uncoated. Unit of measure: Inch.