Straight Flute Step Drills 
Spiral Flute Step Drill Bit 
3pcs Setp drills, packing with metal box, wooden box, double blister 
 

 3pcs Step Drills Set
3/16 - 1/2 x 6 step
1/8 - 1/2 x 13 step
1/4 - 3/4 x 9 step

4 - 12mm x 9 step
4 - 20mm x 9 step
4 - 30mm x 14 step
 
4 - 12mm x 9 step
6 - 20mm x 8 step
6 - 30mm x 13 step

(1) Stright Flute / Spiral Flute;

(2) Shank: 
              Round shank; 
              Hex shank; 
              Three flat shank; 
               Hex quick change shank;

(3) Surface:
             white bright;
             Titanium coated;
             Black nitrided;
             Cobalt coated;

(4) Packing: (a) wooden box. (b) aluminum case. (c) blister with card.