Specs

Quantity: 1 piece

Diameter: No. 19 (≈4.22 mm)

Overall length: 12 in

Material: Cobalt alloy (high-speed steel with cobalt)

Type: Aircraft extension drill bit

Usage focus: Deep-hole drilling in metal; long-reach applications

Features

12″ reach enables drilling in deep cavities, pockets, and recessed areas that standard bits cannot access

Cobalt alloy construction provides enhanced heat resistance and wear life when drilling hard metals

Precision-ground tip offers reliable starts with reduced walking on metal surfaces

Long-hole drilling design tailored for metalworking, maintenance, and fabrication tasks requiring extended reach

Use-case examples: automotive engine blocks, aerospace components, and machinery housings where deep reach is necessary

Overall length: 12 in

Diameter: No. 19