Micro 100 Boring Bar, manufacturer part number HBB-4803000.
Specifications: Minimum Bore Diameter: 0.4800 in; Maximum Bore Depth: 3.0000 in; Shank Diameter: 1/2 in (0.5000 in); Overall Length: 4.0000 in; Hand Direction: Right; Neck Diameter: 0.4400 in; Centerline Offset: 0.2400 in; Face Dimension: 1/4 in (0.2500 in); Projection: 0.0200 in; Head Width: 0.4600 in; Split Length: 0.9600 in.
Coating/Finish: Uncoated. Unit of measure: Inch.