Specifications:
Cutting Edge Diameter: 15mm / 0.59"
Shank Diameter: 1/2", 10mm / 0.39"
Cutting Edge Length: 78mm / 3.07", 55mm / 2.17"
Total Length: 160mm / 6.3", 150mm / 6"
Material: High Speed Steel 9341(HRC62-65), High Speed Steel 4341 (HRC63-65)
Finish: Nitride Coated, Titanium and Nitride Coated
Shank Type: Round Shank, Tri-flat Shank
Package Content: 2pcs x 15mm Reduced Shank 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.
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. Universal round shank for easier clamping and stable cutting process. Tri-flat on the shank of drills are constructed for tighter clamping and precise drilling.
Gold titanium and black nitride dual coating can apply lubricant better for smoother drilling and is more durable and corrosion resistant than the regular black surface. Black nitride coating adds lubricity for smoother drilling and is more corrosion resistant.
Sharp spiral flutes provide neat and smooth cuts. 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.
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.