[4-20mm 9 Ladder]
[4-12mm 5 ladder]
Total Length: 2.6 inches (6.5 cm) (L)
Shank: 0.3 inch (7.1 mm) (dia)
Size:4-12 mm(4,6,8,10,12mm)
Material: High speed steel 4241 (object under 25° hardness)
4? 12mm Titanium Coated HSS Pagoda Step Hole Cutter Drill for Sheet Metal Wood