4-20mm Black Step Spiral Groove Drill Speed Steel Spiral Conical Cone

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High hardness, unique stepped structure, a drill can open a variety of size aperture.
Suitable for these work-pieces that hardness is lower than 25 degree and the thickness is below 4mm, such as aluminum parts, insulation board, PVC plate, etc.
The central punch is not needed, small shaking, hard to be broken.
Used with drill or bench drill, water it to cool while working to prolong its life.Specification:Material: HSS(High Speed Steel)
Shank Type: Shank
Type: Spiral Grooved
Surface Treatment: Nitriding black
Step Diameter: 75mm/2.95inchPackage Includes:1 Piece 4-20mm HSS Shank Spiral Step DrillNote:We suggest customers to use fluid to keep the bits cold during usage to avoid step drill bits become overheated and get burned up due to fast rotary friction.Spiral Flute Step Drill;Spiral Step Drill;Spiral Step Drill Bit;HSS Spiral Step Drill;Conical Cone Drill Bits;Spiral Grooved Step Drills

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