Key features

• •Great Value Set:Cost-effective set,1PCS Forstner Bit Extension (3-1/4" Drilling Depth) +1PCS Forstner Bit Extension (5-3/4" Drilling Depth) 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: 4.5inch & 7inch, Extend Length: 3-1/4" & 5-3/4" inch.
• •Tools Require Good Materials: Our extension poles are built with rugged,high carbon steel for structural stability, with precision ground and polished surfaces;
• •Note:The inside diameter of our forstner drill bit extension collet is 3/8 inch,so it will only fit forstner drill bits with 3/8 inch or smaller shanks; Tighten the screw before use to prevent the drill bit from slipping when rotating at high speed
• •Extends any Forstner bit shank an additional 3-1/4" & 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;