Spiral Flute Step Drill Set/ 4-12,4-20,4-32/ Nitrided HSS Step

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High hardness,unique stepped structure,can drill a variety of size aperture.
HSS spiral grooved step drill.Drilling holes in materials like plastic, aluminum, wood, copper, stainless steel and other types of sheet metal.
Split point tip accelerates speed and preventing angled walking away from center line of bore.
Suitable for below 25 hardness of the work piece,such as thin , aluminum, insulation board, PVC board, planks, and wood thickness below 4mm.
Use water to cooling it when working in order to use longer time.Specification:Material: HSS(High Speed Steel)
Shank Type: Shank
Type: Spiral Grooved
Surface Treatment: Nitrided,Black
Step Diameter:
4-12: 65mm/2.56inch
4-20: 75mm/2.95inch
4-32: 100mm/3.94inchPackage Includes:3 Pieces HSS Spiral Step Drill
Note:We suggest customers to use fluid to keep the bits cold during usage to avoid step become overheated and get burned up due to fast rotary friction.Spiral Step Drill Kit;Spiral Flute Step Drill;Spiral Step Drill Bit ;HSS Spiral Step Drill ;Conical Cone ;Spiral Grooved Step Drills

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