Custom heat-treated alloy steel blades.Black oxide coated for corrosion resistance. Precision machined tips for a precise fit. High torque acetate handles for superior durability and solvent resistance. Includes 1 each: T103A T10 x 3", T153A T15 x 3", T203A T20 x 3", T253A T25 x 3", T304A T30 x 4".