The second stage of four, 3M Diamond Handpad is more coarse and used for taking off sharper edges than the fine and extra fine. 3M Diamond Abrasives cut with speed and consistency. Diamond Abrasive is resin bonded to a flexible backing in a precise dot pattern for supreme durability and cutting uniformity. Made by 3M these are the best quality diamond pads on the market. Diamond surface area 90mm x 55mm. M40 400 Mesh. Works best when used with water. Images are for illustration purposes only.