1. With the flexible hose, you can work in tight places. Thick pipes and extended mounting rings make the flexible shafts more sturdy and durable. 2. There is no specification of the corresponding interface of the electric grinder, provided that the electric grinder or drill can be interposed. A size of 6.5mm, easy to install, just fix the power connector handle to the grinder 3. The installation is convenient and simple, you just need to attach the connector handle to the electric grinder. The shaft connector must be connected using an electric grinder. 4. Use to extend the power tools to grind the small workpiece in a specified area. Specification: Material: Metal. Installing the shaft as shown in the attached photo: 1) Remove the rotary nut from the collet and the top cap from the rotary tool. 2) Slide the collet nut onto the shaft core. 3) Insert the shaft core into the neck. 4) Tighten the collet nut. Make sure the shaft core is securely held in the instrument. 5) Haft connector screw on rotary tool. This will ensure that the shaft core is pushed into the shaft. Drill Bit Installation Instructions: 1) Insert the included L-bar into the hole on the side of the arbor clamp. 2) Unscrew the clamping nut from the shaft. 3) Insert the bit, not included, into the clamping rod 4) Tighten the clamping rod nut. 5) Remove the L-bar Box contents: 1 slbrillre flexible rod. 1 handle 1 key.