Features 1、Fast Working: The twist drill bit has spiral flute for easier chip removal and high drilling efficiency as well. 2、Accurate Use: Comes with 118 degree angle and 21mm incisive blade, which ensures good accuracy in your working. 3、HSS Material: Forged with premium high speed steel material with good hardness, very sturdy, stable and reliable. 4、Wide Utility: Allows for wide application on iron, aluminium, copper, stainless steel and many other materials. 5、Easy to Install: 1/2in straight shank, light weight and compact size make the installation much more convenient. Specification Item Type: Twist Drill Bit Product Material: High Speed Steel Shank Diameter: Approx. 12.7mm / 0.5in Blade Length: Approx. 74mm / 2.91in Blade Diameter: Approx. 21mm / 0.83in Application: Suitable for iron, aluminium, copper, stainless steel, high speed steel, manganese steel, various quenched steel parts. Package List 1 x Twist Drill Bit