3Pcs 1/4 Inch Hex Shank Blue Nano Coated Step Drill Bit Set 4-12/4-12/4-32mm

Specification: 
Material: HSS 4241 / High Speed Steel 4241; 
Coating: Blue Nano; 
Shank Size: 1/4" Hex Shank; 
Quantity: 3Pcs; 
  
Step Drill Step Size: 
4-12mm:(3,4,5,6,7,8,9,10,11,12mm, 10 Steps); 
4-20mm:(4,6,8,10,12,14,16,18,20mm, 9 Steps); 
4-32mm:(4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm, 15 Steps); 
  
Features: 
1: Made of high quality high speed steel 4241; 
2: New blue nano coating surface treatment, 3-5 times longer drill life than other drill bits; 
3: Sharp drill and no burr; 
4: Suitable for drill hole on a variety of materials including steel, brass, wood, plastic, etc; 
  
Package Included: 
3 Pcs x Step Drill Bits 4-12+4-12+4-32mm