1. This product can only be used with machines with flexible shafts such as desktop polishing machine, hanging , electric drill, electric , etc. Be to install it on the right side of the table grinder, or the flexible shaft will be damaged in the opposite direction 2 After 10 minutes of use, the machine must be shut down for 2-3 minutes to avoid overheating of the product, and it can be reused after the machine is completely cooled 3. This product can only the surface of the material, and the cutting angle should be controlled at 15-20 degrees. The angle should not be too or even vertical Color: as shown Material: high carbon steel Package Contents: 1 x Electric Chisel 5 x Knives 1 x Open Wrench 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.