ASNOMY 7Inch Extra Long Forstner Bit Extension for Adding Over 5-3/4 inches of Drilling Depth to Your 3/8″ Round or Hex Shafts Forstner Bit

About this item ?Extends any Forstner bit shank an additional 5-3/4 inches, Helps you use standard forstner drill bits drilling for flat bottom holes or start deep hole turning projects like on larger vases or containers; ?The collet inside diameter is 3/8 inch(9.7mm). This tolerance is very tight and designed to accept forstner bits with shank sizes of 3/8 inch or slightly smaller; ?High-carbon steel construction, precision ground and polished, ensuring it’s sturdy and durable; ?Two set screws and hex key included. To fasten the shank in place, use the hex key to tighten these screws; ?Hex Shank Dia.: 3/8-inch, Total length: 7 inch, Extend Length: 5-3/4 inch.