Drill America 5 Piece High Speed Steel Aircraft Extension Drill Bit Set (1/4-1/2" x 12" Long), POU Series

Drill America 5 Piece High Speed Steel Aircraft Extension Drill Bit Set (1/4-1/2" x 12" Long), POU Series

• Sizes included are 1/4", 5/16", 3/8", 7/17" and 1/2" with overall length of 12"
• High-speed steel tools are good for most general purpose applications, offering 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
• For general purpose drilling in applications where extra length for reach is required, designed to perform in a broad range of materials in the iron and steel families
• Manufactured to national aerospace standard 907