Product description: Extra Diamond layer for longer life and use. Material: Electroplating silicon carbide Specifications:100mm Thickness:1.6mm Inner hole:20mm Max RPM:14500 Packing list: 2*Diamond cutting disc Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.