Features: 100% Brand new and high quality. Solid alloy material, study and durable for usage. Greatly improve the accuracy, save time and convenient for operation. East to install and use. High precision, smooths surface, exquisite design. Practical and useful tool for engraving machine. Specification: Condition: 100% Brand New Material: Alloy Color: Black + Red Product Size: Disk Approx. 35 x 19.5mm / 1.4 x 0.77in Package Weight: Approx. 53g Package Included: 1 x Engraving Machine Tool How To Use: Connect the wire of this tool check instrument to the tool connector of your control board of the machine, then the control board's GND connect to the frame of your router (the frame of the router and the spindle must have connections)