HSS 4241 Step Drill Bit Set， GLANICS High Speed Steel Step Drill Bit Set 3-Piece Set with Automatic Center Punch (Set of 3+1)[Product Information]- ★ 28 SIZES INDIVIDUAL DRILL BITS IN 3 - Instead of 28 individual drill bits， GLANICS 3 standard step drill bits are more convenient. Bit #1 (6 steps): 3/16"， 1/4"， 5/16"， 3/8"， 7/16"， 1/2"; Bit #2 (13 steps): 1/8"， 5/32"， 3/16"， 7/32"， 1/4"， 9/32"， 5/16"， 11/32"， 3/8"， 13/32"， 7/16"， 15/32"， 1/2"; Bit #3 (9 steps): 1/4"， 5/16"， 3/8"， 7/16"， 1/2"， 9/16"， 5/8"， 11/16"， 3/4".
- ★ SMALL DESIGN WITH BIG USE - Two-fluted design provides faster， smoother cutting while avoiding the inconvenience of a tri-flat shank to ensure a firm grip.
- ★ EXCELLENT DURABLE PERFORMANCE- Made from High Speed Steel (HSS)， and plating with titanium gold on the surface， more durable.
- ★APPLICABLE MATERIALS - Provided with small pressure and the sets can cut through wood， sheet steel， aluminium product， insulating plate， PVC board and other surfaces thinner than 5mm.
- ★ AUTOMATIC CENTER PUNCH - Match with one automatic center punch which is high-impact， spring-loaded strike when pressed against surface， help you to mark hole locations before starts drill bits and screws.
