Description:  4-piece Set Includes 6mm Capped Center Punch Locator and 3pcs HSS Hexagonal Shank Step Drill.     Specification:  Step Drills:  Product Name:Titanium Coated Step Drill Bit;  Material:HSS / High Speed Steel;  Surface Treatment:Titanium Coated;  Shank Size:1/4" Hex Shank;  Sizes: 4-12mm( 5 step ): 4mm,6mm,8mm,10mm,12mm;  4-20mm( 9 step ): 4mm,6mm,8mm,10mm,12mm,14mm,16mm,18mm,20mm;  3-12mm( 10 step ): 3mm,4mm,5mm,6mm,7mm,8mm,9mm,10mm,11mm,12mm;  Quantity: 1 Pc x 5 Step bit;  1 Pc x 9 Step bit;  1 Pc x 10 Step bit;  Center Punch Locator: Produce Name:Center pin punch;  Specification:With red hat;  Color:Golden;  Bit material:HSS steel;  Main body material:Tool steel;  Total Length:Approx 128mm;  Bit diameter:6mm;     Features: Center Punch Locator.  -Adjustable automatic center punch and window breaker.  -Delivers high-impact, spring-loaded.  -Enlarged plastic handle for impact cushioning.  Step Drills: - This is the New HSS Steel Large Step Cone Drill Titanium Bit Set Hole Cutter, which is made from high quality HSS steel, and with the Titanium coated to reduce friction and heat.  - It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.     Package Included: 1 X    With red hat center pin punch;  1 X    5 Step bit;  1 X    9 Step bit;  1 X    10 Step bit