About this item

• The step drill bits are made of classic high-speed steel with titanium coating for proven capability and durability in drilling holes , aluminum, wood board, copper, stainless steel and many other types of sheet metal.
• The HSS step drill bit set is designed with double cutting blades, which provides faster, smoother and accurate drilling.
• Each unibit step drill bit optimally fits into power tools such as impact drill chucks securely and eliminates slip for higher efficiency of output.
• 3-Piece HSS Groove Step Drill Bit (3-12mm/4-12mm/4-20mm ). 1/4" Hex shaft drives are suitable for all kinds of for home DIY power drills.
• Suitable for home DIY, and general building/ engineering use.t slippage and shedding during the rotation.