Micro 100 Boring Bar, manufacturer part number QBB-290500X.
Specifications: Minimum Bore Diameter: 0.3100 in; Maximum Bore Depth: 1/2 in (0.5000 in); Shank Diameter: 5/16 in (0.3125 in); Overall Length: 2.0000 in; Hand Direction: Right; Neck Diameter: 0.2170 in (5.50 mm); Centerline Offset: 0.1338 in; Projection: 0.0730 in; Tooth Width: 0.2000 in; Length from Holder: 0.8530 in; Corner Radius: 0.0050 in.
Coating/Finish: AlTiN. Unit of measure: Inch.