Feature:

-Unique step design,a drill bit can be used to open holes of various sizes,means the equivalent of a box of drill 
-High-speed steel tools are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance 
-Having Mutifunction, a terrific helper to be used for deburring,chamfering,expanding hole 
-Stable,working witout pre-working. 
-Packed in a Nylon Bag,offering good protection. 

Usage: Aplly in gun-drilling,bench drill

Material: HSS Steel 
Surface Treatment: Titanium coated 
Type: Step Drill 
Head Type: Hexagon Shank 
Quantity: 3PCSl 
Color: Gold 

Size: 
Length: 
5 Step Bit: 4-12mm Length: 6.7cm/ 2.64"""" 
9 Step Bit: 4-20mm Length: Approx. 7.4cm/ 2.91"""" 
15 Step Bit: 4-32mm Length: Approx. 10.2cm/ 4.02""""

The 3 Hole Cutters Come in the Following Sizes: 
15 Step Bit: 4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 2mm) 
9 Step Bit: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 14mm, 16mm, 18mm, 20mm) 
5 Step Bit: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm)

Package Includes: 
1X Set(3pcs)Step Drill with Nylon Bag