Cleveland Golf C13192 5/16x12 In HSS pneumatic accessory

Extra-long drill bit for deep holes

This 12-inch aircraft extension drill reaches into cavities where standard bits cannot. The 5/16-inch diameter suits fractional-inch drilling tasks in maintenance and fabrication shops. High-speed steel construction keeps the edge intact during repetitive use. Buyers who need a shorter bit or a coated surface will not find those options here.

Split-point tip and bright finish

The 135-degree split point centres the bit without a centre punch and reduces walking on hard materials. An uncoated bright finish allows the operator to see wear and apply cutting fluid directly. The 21-to-34-degree helix range helps chip evacuation at the 4xD depth rating. Users who rely on coated bits for high-speed production should look elsewhere.

1-1/4 inch maximum drilling depth

The 4xD rating limits effective drilling depth to 1-1/4 inches despite the 12-inch overall length. This specification decides whether the bit can complete the hole in a single pass. Match the depth requirement to the workpiece before ordering. Builders who need deeper holes in one operation must choose a different tool.