Material: high speed steel
Category: Step drill
Series: Drill Bit Set
Model: 3-13 step drill + center punch, 4-32 step drill + center punch, small three pieces + center punch (3-12/4-12/4-20),straight groove large three pieces + center punch (4- 12/4-20/4-32),spiral groove large three pieces + center punch (4-12/4-20/4-32),large three pieces + serrated drill 3pc
