Step Drill Bit,Knoweasy HSS Titanium Coated Spiral Grooved Step Drill 3-Piece Set with Automatic Spring Loaded Center Punch,4-12mm/4-20mm/4-32mm Drill Bits Set for Sheet Metal Hole Drilling Individual 【Innovative Design】: Equipped with a

【Innovative Design】: Equipped with a durable plastic protective box

capable of effortlessly cutting up to 5/32inch steel cable

Automatically adjust itself to the appropriate positions when crimping terminals of different sizes

and the carbide tipped bit makes the center punch 10 times stronger than normal one

Step Drill Bit,Knoweasy HSS Titanium Coated Spiral Grooved Step Drill 3-Piece Set with Automatic Spring Loaded Center Punch,4-12mm/4-20mm/4-32mm Drill Bits Set for Sheet Metal Hole Drilling Individual 【Innovative Design】: Equipped with aTitanium Coating:Coated by titanium,this step drill set performs well in heat,corrosion and rust resistance. Hexagonal Design :The hexagonal shank titanium drill uses a double edged design to make cutting smoother and smoother. High step design allows you to stop and don't drill big!. Advantage:Come with an automatic,high impact,spring loaded strike when pressed against surface,adjustable cap regulates striking force. Application:Perfect for home