Size: 4",4.5",5",7". Thickness of Fiber Paper: 1.8 MM. Grit: 16#,24#,36#,60#,80#. Abrasive Material: Silicon Carbide. Used for Marble and Granite. Hole Type: cross or double cross hoe. Quality is High and Stable. The picture above is the result for grinding metal after 10minutes. 5pcs/shrink,100pcs/carton.