3Pcs HSS Spiral Flute Step Drill Bit Set | Triangle Shank & Center Punch
$25.00
$30.38
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Product Description
Features:
Spiral groove step drill bit
-Titanium coating reduces friction and heat.
-Surface nitrogen treatment (increase hardness and wear resistance)
-High-speed steel: Higher quality than ordinary twisted drilling, and durable.
-Can work without coolant.
-The unique step structure: the drill can drill a variety of sizes of the aperture.
Center Pin Punch
-Simple and accurate to use knurled handle prevents slipping.
-Spring pressure can be adjusted by simply rotating the knurled top of the punch.
Specification:
Spiral groove step drill bit
| Type | Step drill |
| Material | HSS |
| Surface treatment | Nitrogen treatment (increase hardness and wear resistance) |
| Shank shape | Triangular round handle |
| Quantity | 1 Pc x 4-12mm Step Drill Bit 1 Pc x 4-20mm Step Drill Bit 1 Pc x 4-32mm Step Drill Bit |
Size
| Cutting Diameter Range | Length | Shank Diameter | Weight |
| 4-12mm | Approx 65mm / 2.60 inch | 6mm | 18.5g |
| 4-20mm | Approx 76mm / 2.99 inch | 8mm | 47.5g |
| 4-32mm | Approx 101mm / 4.02 inch | 10mm | 167.6g |
Center Pin Punch
| Material | Knurled steel body, alloy steel tip |
| Color | Black |
| Total length | 5 inch |
Package Included:
| 1 Pc x | 4-12mm Step Drill Bit |
| 1 Pc x | 4-20mm Step Drill Bit |
| 1 Pc x | 4-32mm Step Drill Bit |
| 1 Pc x | Center Pin Punch |
| 1 Pc x | Cloth bag |
More Detail:
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