Very durable, convenient to use. Fast fastening, greatly improve work efficiency. Suitable for drill, screwdriver, batch head and other to transfer. It has a 20 pivot mode that allows perfect accessibility to tight spaces and hard to reach areas. It perfectly holds on to screws without the worry of falling off for an easier and more convenient installation. Function: it can change the direction of the batch head and is suitable for operation in a narrow space. Bit tip holder: 1/4inch Colour:Photo Color Material:Metal Package Contents: 5 x Drill Bit Extension Rod 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.