Drill America High Speed Steel Aircraft Extension Drills are good for most general-purpose applications. These drill bits offer a combination of hardness and toughness for wear resistance. Black oxide treatment adds lubricity and creates small pockets on the surface of the tool that act to hold coolant near the cutting edge. Extra-long for when extra reach is required.
Sizes in the set include: 1/4-in, 5/16-in, 3/8-in, 7/16-in and 1/2-in with overall length of 12-in
For broad range of materials such as wood, iron and steel
135° split point tip prevents drill from walking, sizes smaller than 1/16 in. have the 118° standard point
12-in overall length when extra length for reach is required
High-speed steel tools are good for most general-purpose applications, offering a combination of hardness and toughness for wear resistance
Black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow
Manufactured to National Aerospace Standard 907