4pcs hss espiral broca

Specification:Type: step drillMaterial: high-speed steelCase size:12.5*9.5*3.5cmSize:#1: 4-12mm 5 steps(4mm,6mm, 8mm, 10mm, 12mm)#2: 4-20mm 9 steps(4mm, 6mm, 8mm, 10mm, 12mm,14mm, 16mm,18mm, 20mm)#3: 4-32mm 15 steps(4mm, 6mm, 8mm, 10mm, 12mm,14mm, 16mm,18mm, 20mm, 22m, 24mm, 26mm, 28mm, 32mm) Features:Specifical step design, one drill for many sizes, very convenient.Cutting material: iron sheet, aluminum, insulation board, PVC plate wood thickness in 4mm.The hole with a drill can play a variety of.SELF STARTING - No need for a pilot hole.Automatically deburrs holes as you drill. Long Life True high speed steel. Nitriding to make it durable and run cooler.Includes protective padded aluminum case.Package Included:1x 4-12mm drill1x 4-20mm drill1x 4-32mm drill1x case