Product Review

Features:
1/4" Hex shaft drives are suitable for all kinds of power drills.
Double cutting blade design makes for cutting faster,automatic deburring from hole when drilling.
3Pcs spiral step drill bits, 4-12/4-20/4-32mm 29Sizes,main material high speed steel, titanium coated high quality step drill bits.

Special Features:
Titanium alloy coating reduces friction and they are more durable than uncoated drill bits.HSS(High speed steel) has a longer service life.
The tapered design is suitable for drilling larger and deeper holes, or enlarging the aperture in areas where it has been drilled.

Usage:
Cutting holes in materials(hardness:<25 degrees) like iron plate, aluminum plate, insulation boards, PVC sheet, ect.

Sizes:
4-12mm: 5 Steps (4mm, 6mm, 8mm, 10mm, 12mm)
4-20mm: 9 Steps (4mm, 6mm, 8mm, 10mm, 12mm, 14mm,16mm,18mm,20mm)
4-32mm: 15 Steps (4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm,22mm,24mm,26mm,28mm,30mm,32mm)

Package includes:
3 x 4-12/20/32mm HSS Groove Step Drill