Micro 100 Boring Bar, manufacturer part number PBT4-110250.
Specifications: Minimum Bore Diameter: 0.1220 in; Maximum Bore Depth: 1/4 in (0.2500 in); Shank Diameter: 1/8 in (0.1250 in); Overall Length: 1-1/2 in (1.5000 in); Hand Direction: Right; Neck Diameter: 0.0900 in; Centerline Offset: 0.0475 in; Projection: 0.0200 in; Corner Radius: 0.0040 in.
Coating/Finish: Uncoated. Unit of measure: Inch.