two kinds of flap wheel can be available: 1: Flap wheel with metal center specification:diameters:2í¦-20í¦,width:3/4í¦-7í¦ and various specific spec. features:it has the sharp grinding and cutting blades and high security and is ideal for surface polish of metals Applications:it can be mounted on various automatic and manual lapping machines for the grinding and polishing operations,suitable for all sorts of metals. 2: Flap wheel with plastic core specification:width:1í»í»2í»í»and other specifications,diameters:4í»í» 6í»í» 8í»í» 10í»í» 12í»í» and other spec. features:it is poured and injected for molding directly once with high-temperature glue,so that the safety and the adaptability for various specifications of middle holes have been improved. Grits:40#-400# Flap Wheels are manufactured from strips of high quality aluminum oxide material closely packed and radically bonded to a shaft or metal center. These wheels are more durable and provide a longer and cooler cutting action than is possible using conventional discs. Recommended for cleaning, deburring, blending, and polish grinding on stainless steel, aluminum, etc. Conformable to most shapes, they are available in coarse to fine grit.