The abrasive grain is embedded in the sturdy, flexible cloth backing material by means of a resinoid bond. Their flexibility enables them to adapt perfectly to the contours of the workpiece.2" x 1/2" Mounted Flap Wheel - 1/4" Shank - Aluminum Oxide - 80 Grit For universal applications from coarse to fine grinding..
3/4" x 1-1/2" Cartridge Roll, 3/16" AH - Full Taper, Aluminum Oxide 120 Grit For universal grinding work on metals and other materials.. The abrasive grain is embedded in the resinoid coating on the sturdy backing material, which achieves the best possible abrasive performance. They consist of spirally wound coated abrasives.