Thirty steel and six brass blades - 3" x 1/2" with steel thicknesses .002, .0025, .003, .004, .005, .006, .007, .008, .009, .010, .011, .012, .013, .014, .015, .016, .017, .018, .019, .020, .021, .022, .023, .024, .025, .026, .028, .030, .032, .035; brass thicknesses .006, .008, .010, .012, .014, .016
- Knurled lock-nut, which releases the blades instantly for rapid selection of size desired and when tightened locks the individual blade into the working position, retaining the blades not in use firmly in the handle
- sizes marked in both decimal and metric equivalent, are permanently etched on each blade
