3Pcs Step Drill Bit Set
*HSS material
*Heat treated
*Titanium coating surface
*Packed by plastic case
*Available in: Inches OR MM size.
MM: 4-12mm, 1mm/setp; 4-20mm, 2mm/setp; 4-32mm, 2mm/setp
Inches: 3/16-1/2 Inch; 1/4-3/4 Inch; 1/8-1/2 Inch