Micro 100 Boring Bar, manufacturer part number QHBBC-3001750-004.
Specifications: Minimum Bore Diameter: 0.3000 in; Maximum Bore Depth: 1-3/4 in (1.7500 in); Shank Diameter: 5/16 in (0.3125 in); Overall Length: 3.0000 in; Hand Direction: Right; Neck Diameter: 1/4 in (0.2500 in); Centerline Offset: 0.1500 in; Face Dimension: 5/32 in (0.1560 in); Head Width: 0.2750 in; Length from Holder: 1.8530 in; Corner Radius: 0.0040 in.
Coating/Finish: Uncoated. Unit of measure: Inch.