Specifications:
Cutting Edge Diameter: 28mm / 1.1", 30mm / 1.18"
Shank Diameter: 1/2"
Cutting Edge Length: 80mm / 3.15"
Total Length: 150mm / 6"
Material: HSS (High Speed Steel) 6542
Finish: Nitride Coated
Shank Type: Reduced Shank, Round Shank
Hardness: HRC65-66
Color: Black
Package Content: 1pcs x 28mm Drill Bits, 1pcs x 30mm Drill Bits
Descriptions:
High-speed steel straight shank drill bits feature higher hardness and toughness, better wear resistance, suitable for most general purpose applications. Reduced shank drills expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes.
Black nitride coating adds lubricity for smoother drilling and is more corrosion resistant. Small pockets on the surface of the tool that help to hold coolant near the cutting edge.
Sharp spiral flutes provide neat and smooth cuts. High cutting edge strength, fast cutting speed. Spiral groove facilitates the export of metal chip, saving time and effort in operation. Suitable lubricant is conducive to cutting or cooling, making cutting easier and improving smoothness and dimensional accuracy. It can help to extend the service life of tools.
Widely used for drilling stainless steel, aluminum alloy, cast iron, high carbon steel, wood and plastic. Used on electric hand drill, drilling machine and bench drill.
When using hand-held electric drill, the recommended speed is 100-1000rpm/min; the larger the drilling diameter, the slower the drilling speed. Drill metal with high hardness, the rotational speed should be slower than normal drilling.