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> > > > Step Drill Bit Quick-Change Hex Shank 4-12mm/4-20mm/4-32mm HSS Titanium Coated Cone Pagoda ShapedFeatures
HSS Step drill bit is made of high grade HSS Steel (High Speed Steel) 4241 which used for drilling metals, steel, brass and also other materials such as plastic. It is made of steps cone shape so that the worker can control or select the size of the diameter need to be drilled.
Variations:
4-12 : 4,6,8,10,12mm (5 steps)
4-20 : 4,6,8,10,12,14,16,18,20mm (9 steps)
4-32 : 4,6,8,10,12,14,16,18,20,22,24,26,28,30,32mm (15 steps)