Item: Step Drill Bits
<br />Material: High Carbon Steel
<br />Blade Length: 50 (mm) / 1.97 inch
<br />Full Length: 80 (mm) / 3.15 inch
<br />Blade Diameter: 32 (mm) / 1.26 inch
<br />Handle Diameter: 10 (mm) / 0.394 inch 
<br />Applicable Scope: Woodworking Punch 
<br />The product is available in 4-32, 4-20, 412 three specifications 
<br />
<br />Four Choices:
<br />* 4-32mm,  15 ladders
<br />* 4-20mm,   9 ladders
<br />* 4-12mm,   5 ladders
<br />* 3 pcs （4-32mm  +  4-20mm  +  4-12mm）