3Pcs Step Drill Bit Set 3-12Mm 4-12Mm 4-20Mm Titanium Coated Spiral Grooved Drill Cone Bits for Wood Metal Drilling Cutting

• Quality Step Bits: The step drill bits are made of classic high-speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, wood board, copper, stainless steel and many other types of sheet metal.

• Tri-flatted Shank: Each unit step drill bit optimally fits into power tools such as impact drill chucks securely and eliminates slip for higher efficiency of output

• Well Performance: The multiple hole drill bit set can cut workpieces with a hardness of <25, such as thin iron plates, insulating plates, and wood panels, creating relatively clean holes as you drill

Specifications:

• Name: Step Drill Set

• Material: High-speed steel 4241

• Surface treatment: Titanium plating

• 4-20: 9 levels: 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm

• 3-12: levels: :3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm

• 4-12: 5 levels: 4mm, 6mm, 8mm, 10mm, 12mm