Extension Length: The 3 piece set extends the shank drill bit an additional 8and3 or 4 inches to 5and3 or 8 inches. Quality Material: Our drill bit extensions are made of quality steel material, with sturdy structure, not easy to break or damage. Precision grinding and polishing ensures that it can be used for a long time. Easy to Use: The drill bit extension includes two fixed screws and hexagonal spanner. To secure the shank in place, tighten these screws with the hexagonal spanner, easy to use. Function: Our drill bit extension allows you to extend any shank drill bit extra long to help you drill flat holes with a standard drill bit or start a deep hole turning project, such as on larger vases or containers. Compatibility: 3 piece set chuck have 3 or 8 inch and 2 or 5 inch inside diameters for drills with shank sizes of 2 or 5 inch 3 or 8 inch or slightly smaller. Made of premium steel, this drill bit extension is sturdy and wear- for long-term use. It is great for extending any shank drill bit extra long to help you drill flat holes with a standard drill bit or start a deep hole turning project. Fix Screw: The drill bit extension is designed with fixed screws, which helps secure the shank in place for efficient extending working. Product Name:Drill Bit Extension Quantity:3Pcs set Colour:As Shown Material:steel Package Contents: 3 x Drill Bit Extenders 3 x Wrenches Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.