3 Pcs step drill bit set

3 pcs step drill bit set
1pcs 4-12mm，1mm/step，Shank diameter：6mm
1pcs 4-20mm，2mm/step，Shank diameter：8mm
1pcs 4-32mm，2mm/step，Shank diameter：10mm
Material：HSS
Applies to Steel Plate thickness≤3mm
Packed by plastic box