10pcs 5mm Nitride Titanium Coated High Speed Steel (HSS) 4341 Twist Drill Bits 1/4" x 1/4" Heat treated chrome vanadium alloy

Heat treated chrome vanadium alloy steel drop forged body provides long life durability

there are two kinds of size and three kinds of color

Diameter: 7

Only one side is covered with a protective film(Remove the protective film when using)

10pcs 5mm Nitride Titanium Coated High Speed Steel (HSS) 4341 Twist Drill Bits 1/4" x 1/4" Heat treated chrome vanadium alloy4341 high speed steel contains high content of carbon and alloy elements, providing excellent cutting performance, high heat resistance, high hardness, wear resistance and durability. Suitable for applications requiring precise and efficient processing. Black nitride and gold titanium dual coatings can apply lubricant better for smoother drilling and are more durable and corrosion resistant. Large spiral grooves facilitate the export of metal chips,