Description :
3pcs HSS Spiral Grooved Step Drill Bit 4-12\/4-20\/4-32
Features :
No need for a pilot holeTitanium coated to reduce friction and run coolerLarge bit has 3 sided shank.Automatically deburr holes as you drillHigh speed steel，durable.Widely used to cut holes in a variety of material like steel， wood， thin iron， aluminum alloy， insulation boards， PVC sheet，ect
Specification :
Color : Golden (as picture shown)Material : High speed steelSurface :Titanium PlatedScop : thin iron plate，aluminum，insulation panels，PVC panels 4mm thickness within the timber.
4 - 12 mm 9 Steps (4mm，5mm，6mm，7mm，8mm，9mm，10mm，11mm，12mm)，7cm(L)4 - 20 mm 9 Steps (4mm，6mm，8mm，10mm，12mm，14mm，16mm，18mm，20mm)，7cm(L)4 - 32 mm 15 Steps (4mm，6mm，8mm，10mm，12mm，14mm，16mm，18mm，20mm，22mm，24mm，26mm，28mm，30mm，32mm)，10cm(L)
Package included :
1 x 4-12mm Spiral Grooved Drill1 x 4-20mm Spiral Grooved Drill1 x 4-32mm Spiral Grooved Drill
Details pictures :