3M 6200J series 2-1/4 Inch x 3-3/4 Inch flexible diamond hand lap has metal plated bond which securely anchors micron graded diamonds to backing. M74 micron grade hand lap is ideal for hard to grind material, stone, glass, ceramic, metal, carbide and composites. It renders long lasting life when used with water or oil lubricants and is perfect for wet or dry applications. - 3M Flexible diamond hand lap 6200J is a versatile hand-held abrasive that optimizes the sharp cutting action of diamond mineral to grind and finish many materials, including chilled iron, granite, carbide, composites, non-ferrous metals, thermal spray coatings and exotic alloys.