Feature:
1)The forstner bit extension gives you additional 5-3/8 inches of reach to bore deeper into your projects.
2)The collet inside diameter is 2/5 inch(10.5mm),designed to accept forstner bits with shank sizes of 2/5inch or slightly smaller;
Specification:
Material: High-carbon steel
Shank Dia.: 3/8-inch;
Extend Length: 5-3/8 inch;
Total length: 6-11/16 inch.
Package:
1x Forstner bit Extension
1x Hex Key